23 Feb 2018

Colourful Wood: Spalting Fungi

by Jan Thornhill

Chlorociboria produces blue-green fruit bodies.
Chlorociboria produces gorgeous blue-green fruit bodies.
It’s easy to forget while collecting fungi that the ones we find growing on wood and elsewhere are only their fruiting bodies—the actual organism is usually hidden, its mycelium buried deep in wood or soil. But the microscopic mycelium of some wood-loving fungi make it very clear just how large an area they’ve taken over by staining the wood they’ve colonized. This staining, which can sometimes be dark lines, other times extensive areas of colour, is called spalting.

Blue-green wood spalted by the cup fungus Chlorociboria.
Wood stained blue-green by the fungus Chlorociboria.
The fairly common Chlorociboria aeruginascens and its sister C. aeruginosa, which can only be differentiated microscopically, stain the wood they’ve colonized a stunning blue-green with the pigment xylindein. This beautiful blue wood has been used by woodworkers since at least the 15th century, primarily in inlays (see examples here). It’s such a striking colour that studies are underway to find a way to inoculate various forest trees with Chlorociboria to enhance the value of the lumber. I used to be impressed that anyone had ever found a piece of this blue wood in good enough shape to use for anything other than as a conversation piece. Until last year, whenever I found itthe wood was already so decomposed I could easily pull it apart with my fingers.

And then I came across this oak tree that had fallen across a park path:

Ruby & Fritz inspecting spalted log
Though the colour of this Chlorociboria spalted log is a much
darker than usual, the wood is still usable.
And then I discovered a much more uncommon disc fungus that also stains wood.

Patinellaria sanguinea produces tiny black discs and stains wood coral red
Patinellaria sanguinea stains wood coral red. 
I had found a mystery purple crust growing on a branch in the fall. I couldn't get any spores from it to aid identification, so I wet it and put it in a plastic container, hoping that by giving it a little warmth and moisture it might revive and offer me some spores. The only thing that happened was that it started decaying. I was about to relegate the branch to the kindling pile when I noticed that in a couple of places its surface was oddly coloured with reddish-pink spiderwebby fuzz. I assumed this was just an unusual mold, but when I got out my loupe to inspect it I was surprised to see a multitude of minute blackish discs embedded in it. Hmm.

Patinellaria sanguinea under microscope
Amazing colour of "black" Patinellaria sanguinea fruit bodies under the microscope.
When I put a sample under the microscope I immediately saw that the pink fuzz was not a mold, but a hyphal mat, or subiculum, that clearly belonged to the blackish discs. Not only that, but, when sectioned, the “black” discs were actually quite strikingly coloured. There were even some asci and spores.

Wood stained, or spalted, by Patinellaria sanguinea 
None of my books gave me a name, so I got out my knife out and carved a few chunks off the branch to dry for later study. It was only then that I realized my little ascomycete had stained the wood a gorgeous coral red. 

Days passed. I was doing an unrelated image search for another minute black disc, Patellaria atrata, when halfway down the page a picture jumped out at me. It clearly showed exactly what I had accidentally grown—mini blackish discs with a pinkish red subiculum. And they had a name. Panitellaria sanguinea

I have not been able to find out much about this little curiosity, which has also been known as Durella sanguinea and Peziza sanguinea, other than that it’s rare, grows in North America and Europe, and apparently prefers hardwoods. 

A number of common wood-decaying fungi spalt wood with black
lines – barriers that keep other fungi out of their "territory."
Spalted wood created by several different
species, including Chlorociboria.

(N.B. This post appeared in a slightly different form on my blog, Weird & Wonderful Wild Mushrooms)

More Info:


Tom Volk’s Chlorociboria page
Panitellaria sanguinea on Mycoquebec
Panitellaria sanguinea on Mycokey
Robinson, S.C., Tudor, D., Snider, H., Cooper, P.A. 2012. Stimulating growth and xylindein production of Chlorociboria aeruginascens in agar-based systems. AMB Express 2(15).
More about spalting: Northern Spalting
George Grant Hedgcock. "Studies Upon Some Chromogenic Fungi which Discolor Wood." St. Louis, 1906

16 Feb 2018

Following in Darwin's wake

Post by Helaine Becker

For those of us who get all fluttery when we hear the words "Voyage of the Beagle," have I got a post for you!

I recently had the splendid opportunity to travel to the "End of the World" Punte Arenas, Chile and Ushuaia, Argentina.  Both feature significantly in the history of Charles Darwin's famed journey of discovery.

Ushuaia bills itself as the sourthernmost city in the world. It is also the departure point for boat trips in the Beagle Channel, which was indeed named for that Beagle.

Here's what Darwin himself had to say about the Beagle Channel:

"As we proceeded along the Beagle Channel, the scenery assumed a peculiar and very magnificent character[…] The mountains were here about three thousand feet high, and terminated in sharp and jagged points. They rose in one unbroken sweep from the water’s edge, and were covered to the height of fourteen or fifteen hundred feet by the dusky-coloured forest."

The channel is just as stunning today, as well as alive with sea lions, cormorants, albatross and penguins (the subject of a future post).



But the real thrill for Darwin fans was at Punte Arenas, the southernmost city in Chile. It lies on the Magellan Strait, through which Magellan travelled on his 'revolutionary' voyage around the world, and which, yes, the Beagle travelled. 

Here's what Darwin had to say in The Voyage of the Beagle:


"June 1st.—We anchored in the fine bay of Port Famine. It was now the beginning of winter, and I never saw a more cheerless prospect; the dusky woods, piebald with snow, could be only seen indistinctly through a drizzling hazy atmosphere. We were, however, lucky in getting two fine days. On one of these, Mount Sarmiento, a distant mountain 6800 feet high, presented a very noble spectacle. I was frequently surprised, in the scenery of Tierra del Fuego, at the little apparent elevation of mountains really lofty. I suspect it is owing to a cause which would not at first be imagined, namely, that the whole mass, from the summit to the water's edge, is generally in full view. "


Where the Beagle anchored in the Magellan Strait.


Darwin then went on to describe  what he saw in the extremes of Patagonia:

"When the Beagle was here in the month of February, I started one morning at four o'clock to ascend Mount Tarn, which is 2600 feet high, and is the most elevated point in this immediate district. We went in a boat to the foot of the mountain (but unluckily not to the best part), and then began our ascent. The forest commences at the line of high-water mark, and during the first two hours I gave over all hopes of reaching the summit. So thick was the wood, that it was necessary to have constant recourse to the compass; for every landmark, though in a mountainous country, was completely shut out. In the deep ravines, the death-like scene of desolation exceeded all description; outside it was blowing a gale, but in these hollows, not even a breath of wind stirred the leaves of the tallest trees. So gloomy, cold, and wet was every part, that not even the fungi, mosses, or ferns could flourish. In the valleys it was scarcely possible to crawl along, they were so completely barricaded by great mouldering trunks, which had fallen down in every direction. When passing over these natural bridges, one's course was often arrested by sinking knee deep into the rotten wood; at other times, when attempting to lean against a firm tree, one was startled by finding a mass of decayed matter ready to fall at the slightest touch. 

We at last found ourselves among the stunted trees, and then soon reached the bare ridge, which conducted us to the summit. Here was a view characteristic of Tierra del Fuego; irregular chains of hills, mottled with patches of snow, deep yellowish-green valleys, and arms of the sea intersecting the land in many directions. The strong wind was piercingly cold, and the atmosphere rather hazy, so that we did not stay long on the top of the mountain. Our descent was not quite so laborious as our ascent; for the weight of the body forced a passage, and all the slips and falls were in the right direction.

I have already mentioned the sombre and dull character of the evergreen forests, in which two or three species of trees grow, to the exclusion of all others. Above the forest land, there are many dwarf alpine plants, which all spring from the mass of peat, and help to compose it: these plants are very remarkable from their close alliance with the species growing on the mountains of Europe, though so many thousand miles distant. The central part of Tierra del Fuego, where the clay-slate formation occurs, is most favourable to the growth of trees; on the outer coast the poorer granitic soil, and a situation more exposed to the violent winds, do not allow of their attaining any great size. Near Port Famine I have seen more large trees than anywhere else: I measured a Winter's Bark which was four feet six inches in girth, and several of the beech were as much as thirteen feet. Captain King also mentions a beech which was seven feet in diameter seventeen feet above the roots."



The Fort at which everyone died, giving the name to "Port Famine" visible in the background.
The terrain Darwin described is exactly the same today, including the "globular bright-yellow fungus, which grows in vast numbers on the beech-trees. When young it is elastic and turgid, with a smooth surface; but when mature, it shrinks, becomes tougher, and has its entire surface deeply pitted or honey-combed.In Tierra del Fuego the fungus in its tough and mature state is collected in large quantities by the women and children, and is eaten uncooked. It has a mucilaginous, slightly sweet taste, with a faint smell like that of a mushroom. With the exception of a few berries, chiefly of a dwarf arbutus, the natives eat no vegetable food besides this fungus."
 



The fungus was very much in evidence during our trip, and just as it was in Darwin's day, is eaten by the locals. I was told that it is called "Indian bread" and when sliced thin, is a grand addition to a salad. The berries, known as Califate, were also ubiquitous. Today they are eaten like blueberries or saskatoon berries, and are used to make an exceptional delicious version of a Pisco Sour. A town in Argentina is even named after them.

Perhaps the most exciting part of the adventure was visiting the reconstructed Beagle that is one of the main features of another Punte Arenas museum.


Detailed life size reconstruction of the HMS Beagle
You can easily imagine yourself doing exactly what Charles Darwin did for those long, long months, including visiting the toilet!





I really loved the discovery that the HMS Beagle had a figurehead that was an actual carved Beagle. The photos below shows the figurehead, one from the reconstruction, the other from a smaller model.

9 Feb 2018

Nature's Black Boxes

By Claire Eamer

Whenever an airplane crashes, you hear about investigators retrieving the plane's black box. It's a device that records essential information about the plane's operation, and it can help investigators reconstruct what happened to bring the plane down.

Tree rings show a tree's history. Claire Eamer photo
Well, there are black boxes in nature too -- lots of them. And they are important tools for scientists who are trying to figure out how Earth's climate changes and what impact those changes have had on the organisms that live on the planet. They're called climate proxies -- essentially indirect clues that let us deduce what past climates were like.

One of the best known black boxes is tree rings. Each year, a tree puts on a ring of new growth. In a good year, the growth ring will be wider, in a bad year, narrower. The science of studying what tree rings can tell us is called dendrochronology, and it has provided a huge amount of information about both natural and human history.

Trees aren't the only organisms that save information in rings. So do fish -- but their growth rings are in their ears. Tiny, disc-shaped bones in fishes' ears -- called otoliths or ear stones[PDF] -- add a ring of growth for every year of a fish's life. As with tree rings, the otolith rings vary, depending on the conditions the fish encountered that year. Even the chemistry of the annual rings changes, so they can hold information about the water the fish traveled through.

The annuli are visible as ridges on this ram's horns.
Pixabay photo
Mountain sheep have a slightly different kind of black box. The rams' horns grow longer and thicker each year, and the ridges that mark each year's growth are called annuli. Like tree rings and otolith rings, the annuli are larger or smaller depending on the conditions the animal experienced that year. In the Yukon, a long-term study of the horns of thinhorn sheep [PDF] revealed a climate fluctuation that repeats every 10 or 11 years and affects the larger ecosystem in which they live.

The biggest natural black box of all is Earth's ice. The great icefields in places like Greenland and Antarctica have been frozen for hundreds of thousands of years -- or even longer. But that ice didn't arrive all at once. It built up year by year with layers of snow that fell and then were compressed into ice by the layers that followed. Digging straight down into a massive icefield is like digging into the past.

Greenland glaciers like this one contain ice more than 100,000 years old.
Pixabay photo.

And that's what icefield scientists do. They drill into glaciers and icefields and extract long cores of ice. Then they analyze the thin layers, examining the chemistry of the water and bubbles of trapped air, the dust and pollen that settled on the glacier's surface, and anything else that might be frozen in the ice. The oldest ice found so far came from Antarctica and is an amazing 2.7 million years old. Ice cores are among the most powerful climate proxies we have, and much of our knowledge of very ancient climates comes from them.

For more information about dendrochronology, explore the EnvironmentalScience.org website.

For some of the things we can learn from fish otoliths, watch the short video on this page.

For a detailed explanation of ice core science, browse through Ice Core Basics.

And for more on climate proxies, try this NOAA site or this page on Palaeoclimatology.


2 Feb 2018

Exploring Haida Gwaii

Sci/Why's peripatetic correspondent Margriet Ruurs sends us another report from a fascinating part of the world - this time from Haida Gwaii, on the western edge of Canada. -CE

By Margriet Ruurs

Haida Gwaii – the very name conjures up images of windblown spruce clinging to rocks surrounded by foamy waves, not unlike an Emily Carr painting. The archipelago stretches along the northern BC coast almost to Alaska. You can reach it by ferry from Prince Rupert or fly in from Vancouver.

We flew into Sandspit, a tiny town on the northeast shore of huge Moresby Island. We wanted to visit the very southern tip, which is in a National Park called Gwaii Haanas. Basically, the only way to reach this remote region is by a Zodiac (inflatable boat) tour offered by a local wilderness company called Moresby Explorers. We studied our options, counted our coins and decided to splurge on a four-day trip with a photography theme.

Bryan, our guide and skipper, picked us up and also five other guests with whom we would spend the next four days on a Zodiac. We drove from Sandspit across a ridge of Moresby Island, on dirt logging roads, to Moresby Landing where we were outfitted with bibbed rain pants, large rain jackets and gumboots. We’d live in these for the next few days. We wore undershirts, a sweater, a fleece jacket topped by our own rain jackets and then the provided rain gear over top. This meant we could only wobble like astronauts in space suits.

Of course we had prepared ourselves for four days of driving rain, grey skies and grey waves. Fortunately, we were lucky and only ended up with a half day of rain and three-and-a-half days of blue sky and sun and/or cloudy but dry weather. Considering that Gwaii Haanas averages rain for about 230 days a year, we were lucky.


We had not even left the Landing when I spotted the first black bear browsing on the intertidal beach. The island’s bears have evolved to have much longer snouts than the mountain bears we are used to seeing on the mainland. Like the Galapagos, even the same species of animals have made adaptations to different local environments resulting in, among others, a different subspecies of stickleback fish in every lake. At least 39 distinct subspecies of plants and animals evolved in the archipelago, including seven mammals, three birds and fifteen species of the stickleback fish that are found nowhere else in the world.

We cruised across inlets and around Louise Island to spend the first night at Moresby Float Camp, a guest house anchored in a secluded fjord. The blue skies reflected in mirror-calm green waters. We docked and were welcomed by two young women who cooked for us, offering us tasty appetizers, tea, coffee and hot chocolate. They even had a fireplace, giving us much needed warmth to warm our chilled hands and feet. After a great dinner of bbq salmon, salad, veggies and rice we fell asleep in no time.

The next morning we bundled up again. This became a ritual: two or three layers of warm clothes, thick socks and gloves. Then our own outer gear, the provided rain pants tucked into the gumboots and the rainjacket over top of everything else. By the time you can’t bend down anymore, you still have to manoeuvre into a lifejacket and into the waiting Zodiac. We’d pull a warm hat and scarf over nose, mouth and face and then we were ready to zoom across Hecate Strait to our next destination.

On our way by Zodiac to the most southern tip of Gwaii Haanas, we visited ancient village sites and remnants of totem poles in several locations: Skedans, Tanu, S’qang Gwaii, Rose Harbour and more. Each site has its own intrigue and charm. Skedans is a village site with house remnants and totem poles, but not as many as in the most southern tip S’qang Gwaii. Here, a mystical and misty atmosphere enhances the site where old spirits dwell and history is tangible. The bleached and weathered totems lean against moss covered house beams. The beach still tells stories of canoe runs between rocks, where the “Vikings of the Pacific” showed their power by rowing their long boats far east, north and south, taking slaves as they encountered other nations.

I was intrigued to learn that a Haida Chief could marry a slave woman, thus making the former slave the most powerful matriarch of the clan. In this matriarchal society, men do as the leading woman dictates and children are part of their mother’s lineage.

I also learned about different totem poles: the shortest one were usually house poles, depicting the family’s clan and history. Tall plain poles with rings are potlatch poles, showing how many potlatches, or celebrations, have been held. Some poles are a memorial for a particular person, sharing his life story, while yet others have a hollowed-out square opening at the top housing a bentwood box of bones: a burial pole. Their silent stories are impressive and pay tribute to a society that lived here long before “contact” – as the period after the arrival of European explorers’ ships is called.

Houses were large, sometimes dug down to allow more space. Immense ceiling beams were held up by corner posts and closed by cedar walls. Now, all that remains is rounded beams covered in soft green moss, often with a new cedar tree growing on each corner as the trees reseeded. Slowly and silently, history is swallowed up by the rainforest. The Haida people have chosen to let their history return to the earth, as it always has, rather than have Parks Canada follow their usual mandate of preserving history.

We were most impressed by the Watchmen. This ancient term refers to Haida who spend the summer in each historic location. They are provided with a small house with a wood stove and basic comforts. Here they work for the summer, hosting visitors. They are extremely well spoken, gracious hosts with a wealth of knowledge about their people. Each host told us amazing stories. Haida Gwaii is made up of stories and the oral history seems alive and well. We heard stories of how people first came to populate the earth when Raven found a clamshell full of little people on Rose Spit. He pried open the shell and the people spilled out. Raven also brought light to the world.

Bear married a woman who gave birth to bear cubs, and in return he gave hunting powers to humans. There are many tales of supernatural beings in this land. Mostly, these are people wearing animal cloaks. Eagle, Raven, Whale, Bear – they all have specific powers and fascinating stories. Haida also strongly believe in reincarnation.

One of the men who told stories, told us of the impressive oral history. “When I was about 10 years old,” he said, “my uncle called me into his house and told me a two-hour story. The next night I had to come back and tell the story back to him without embellishing, best as I could.”

This repeated night after night until he had memorized much of his own history. The tradition continues today as he tells his daughter the ancient tales and makes her tell them back to him.

We learned to chew spruce tips and licorice root. Even ate herring roe on kelp. We saw many, many eagles. A few glimpses of whales as well as two bears.

One overnight was spent in Rose Harbour, an old whaling station. Much debris, buildings and rusty tools remind one of an era when people caught and processed whales for oil. I found it a sad place to be. The lone woman who lives here offers a guest house and meals to Moresby Explorers. We ate greens from her immense garden and freshly caught ling cod. In the morning she ground grains on her converted exercise bike to make us pancakes with rhubarb sauce from the garden. An outhouse and wood-heated shower made it into a rustic adventure.

All photos by Margriet and Kees Ruurs.

26 Jan 2018

Books to Inspire the Outdoor Kid

By Margriet Ruurs

Looking for books that will inspire children to learn more about science?
Here are some great titles that focus on the natural environment.

Water’s Children by Angéle Delaunois
Water's Children has as subtitle ‘Celebrating the resource that unites us all’. The poetic text takes the reader from rainy cities to thirsty deserts, from mountain tops to the ocean shore, and from rice paddies to rain forests. All around the world, children share what water means to them. A lovely way to discuss countries, cultures, and the importance of water.


Water's Children, by Angéle Delaunois, Pajama Press, ISBN 978-1-77278-015-4.


Watch Me Grow and Up We Grow, by Deborah Hodge

Any school that wants to have a garden or nurture children to take an interest in nature should have these two nonfiction picture books. The first title focuses on growing food in the city. From beets and tomatoes in back yards to balconies, and from bees on rooftops to urban chickens, the book shares photos of kids growing things.

The second title takes the reader along on a year on a small farm. Both books offer ideas for growing your own food, including recipes.

Watch Me Grow, Deborah Hodge, Kids Can Press, ISBN 978-1-55453-618-4
Up We Grow, Deborah Hodge, ISBN 978-1-55453-561-3, 


Safari by Robert Bateman
This gorgeous picture book shares the art of Robert Bateman with young readers. Each image is an impressive, realistic painting of an African animal. Part diary, part note book, the text and images take the reader along on a safari to meet such animals as lion, zebra, elephant, wildebeest, and more. It even includes rough drafts of the paintings so that this book will appeal to young artists as well as nature lovers. Text boxes give detailed information on each animal.


Safari, Robert Bateman, Little, Brown, ISBN 978-0670879700.


Wild Ideas, Let Nature Inspire Your Thinking by Elin Kelsey, illustrated by Soyeon Kim.

A nonfiction picture book needs more than interesting facts. It needs a strong voice and an angle that makes it different from other books. Wild Ideas does just that. The environmentalist author looks at animals around the world, and how they solve problems: otters and primates make tools, squirrels copy people, and an octopus can play tricks. How do animals deal with problems and how can you do the same? A fun book to discuss in science and environmental studies. The art adds a whole other level and will inspire many art lessons. For more about the book, check out: www.owlkidsbooks.com/wildideas


Wild Ideas, by Elin Kelsey, Owl Books, ISBN 978-1-77147-062-9


19 Jan 2018

Getting the Science Right

By Joan Marie Galat

How far will an author go to get her facts straight? In my case, it was a nearly-4000-kilometre round trip from my home in Alberta to Laramie, Wyoming. The program, called Launch Pad Astronomy, is a week-long workshop designed specifically for science-writing authors. It was established to make sure writers present science accurately when creating stories or writing nonfiction.

Whether you are reading a book or watching a movie, television show, or other media, it is not hard to get caught up in the story and assume it reflects genuine scientific principles. Launch Pad helps writers avoid presenting or creating misconceptions. Here are a few examples of how science can crop up in creative writing, followed by an explanation of why the scientific reference just won’t work. You will see how easy it is for even a well-intentioned writer to misstep.
  • It was 6 am, too early for the courier to arrive with the first copies of Joan’s new middle-grade (and up) book: Dark Matters-Nature’s Reaction to Light Pollution. She took one last glance at the rising Full Moon and turned inside.
    SCIENCE FAIL: The Full Moon only rises at sunset.

  • It had been dark for several hours. The courier was lost. His GPS battery was dead and his charger not working since it fell into a milkshake. Pulling over, he looked for the brightest star in the sky, certain the North Star would guide him home.
    SCIENCE FAIL: The North Star is not the brightest star in the sky.

  • The courier remembered he needed to call his mother for her birthday. His cell phone was dead and the charger — well, you don’t want to know. Not wanting to admit his shortcomings, he decided upon an excuse. He would say he burned his hand when picking up a meteorite that had landed when he was searching for the North Star.
    Meteorite
    Photo credit: NASA/SETI/P. Jenniskens

    SCIENCE FAIL: It’s not common to find meteorites within seconds of them landing on the ground. Little is known about the immediate temperature of new meteorites, however scientists generally believe small rocks from space will be cool or only slightly warm upon striking the Earth.
Other common misconceptions abound about why seasons occur, the strength of gravity on the Moon, the direction a comet's tail will face, and other topics. The Smithsonian’s “Science Done Wrong” offers additional compelling examples.

Next time you read a book or watch a movie, consider whether the science is accurate and conduct a bit of research of your own to find out what is fact and what is fiction. If you’re a fellow author, consider applying to attend Launch Pad Astronomy. It is an experience you won’t want to miss.


Joan Marie Galat is the author of more than a dozen books, including the Dot to Dot in the Sky astronomy and mythology series. Science talks have taken her from the Arctic Circle to South Korea. Check out her book trailers and speaker demo.

13 Jan 2018

Family Tree for All Living Things

By Paula Johanson

When I want to relax this winter, I've been going to a science website called OneZoom. If you like biology, you might like it too! They've made an interactive image called the Open Tree of Life, that shows on your computer screen a family tree for all living things on Earth. You can zoom in to look at a branch of the family tree. The shape of the family tree is curved like a spiral, and the branches of the tree are curved too. As you zoom in, the shape of a branch is like a smaller version of the entire tree. This kind of design is called a fractal.

I zoomed in today and a circle on the tree grew large enough for me to read: "650 million years ago, during the Cryogenian Period, lived the most recent common ancestor to today's Animals."

OneZoom is a registered charity in the UK. They want to provide easy access to scientific knowledge about biodiversity and evolution. “This NSF-funded project will produce the first online, comprehensive first-draft tree of all named species, accessible to both scientists and the public,” reads their profile on Twitter for Open Tree of Life.

Are you looking for information, and maybe images, to use in your own project such as a school assignment? OneZoom says on their page of Frequently Asked Questions:
Please feel free to use our fractal visualizations as you wish for non-commercial purposes, as long as you credit us. The images themselves have been gathered from a large number of sources (Wikipedia, Flickr, etc.), mostly via the Encyclopedia of Life, and each will have their own licence (either public domain, or cc-by, or cc-by-sa). You can look this up by zooming into the small copyright symbol at the bottom left of every image on the tree: the symbol also serves as a link that will take you to the image page on the Encyclopedia of Life, from where you can find the original source. For more details please see our terms of use. Note that if you wish to use a screenshot without having to provide a list of sources, then we recommend that you use our public domain only visualization (Menu→Settings→Image Sources→Public Domain). We can also produce higher resolution SVG images on request.

Check out OneZoom on their website. Their home page explains a little about this website. To see the family tree, you can either click on their link for the tree of life explorer, or type this link http://www.onezoom.org/life into your browser. You can read tweets posted by OneZoom on Twitter at https://twitter.com/OneZoomTree