ADVERTISEMENT
  About the SA Blog Network













The Artful Amoeba

The Artful Amoeba


A Blog About the Weird Wonderfulness of Life on Earth
The Artful Amoeba Home

The Lost Valley of the Wollemi Pine

The views expressed are those of the author and are not necessarily those of Scientific American.


Email   PrintPrint



In 1994, New South Wales National Parks & Wildlife Service Officer David Noble stumbled on some trees in a canyon in an inaccessible part of Wollemi National Park. He’d never seen anything like them before. Indeed, when he took samples to botanists, they confirmed it was something they’d only ever seen before in the fossil record.

Image (c) Jennifer Frazer

They were the descendants of an ancient line of conifers that had been thought extinct for millions of years. They became known as “Wollemi Pines”.

For those who think there’s little left to discover on our planet, it should be noted these rare trees were discovered a mere 150 km away from Sydney, in a wilderness area in the Blue Mountains. If giant aged trees can still be discovered in this day and age in major, industrialized countries, then there is still plenty out there left to surprise us.

I stumbled onto one of these trees growing in the Mount Lofty Botanic Garden in the Adelaide Hills in South Australia, and it startled me how much the leaves resembled the ancient conifer reconstructions I’d seen at the Denver Museum of Nature and Science.

A closeup of the leaves and cones of Wollemia nobilis. Image (c) Jennifer Frazer

That’s because some of the earliest conifers and the members of the conifer family the Wollemi “pine” belongs to — the Araucariaceae — look very similar. Strap-like leaves, branches growing in distinct whorls, male and female cones, and waxy leaves were and are the order of the day (see here for images of an ancient conifer with a similar look. Also here for a fossil). Modern conifers in the giant Pine family (pines, spruces, firs, larches) and the cypress and yew families continued their march toward water conservation by shrinking the strappy leaves down to needles. But the Wollemi pine and some of the members or the Araucariaceae of its family still retain their ancestral, more leaf-looking leaves.

Wollemi pine was so distinct that it was placed in its own new genus, but there were two other genera in the family. Who else? Some strange and notable plants indeed. Many of them go by the completely, utterly incorrect name of “pine” because there’s no common name for their group, they live mostly in the southern hemisphere (northern members of the family went extinct at the end of the Cretaceous) and english-speaking people thus had no words for these strange trees. Instead, they used “pine” as a generic name for a conifer and appended various local descriptors: wollemi pine, Norfolk Island Pine, Kauri Pine, etc.

You may know Norfolk Island pines from their widespread use as houseplants in the Northern Hemisphere, and landscaping trees in Hawaii and the southern hemisphere. Kauri pines have produced some of the largest living trees in the world, including the mighty Tane Mahuta, “Lord of the Forest”, which I visited in northern New Zealand on my recent trip. I felt an electric shock when I realized the size of it — 43 feet in circumference and 16 feet across. When it comes to truly galactic-scale trees, no still photograph can ever convey their might, so I hesitate to show this picture, but here is me in front of the tree. I’m the small speck at the base of the tree. The tree itself is a good 30-40 feet behind me.

Image (c) Jennifer Frazer

Here’s a closeup of a young kauri’s strappy leaves:

Image (c) Jennifer Frazer

The Araucarians also include the notable and delightfully named “monkey puzzle tree“. Allegedly, the curious name for this  spiky tree came from an observation by one proud owner that climbing that tree “would puzzle a monkey”.

You may have examined some other Araucarians in person, even if you live in America: many of the expired trees in Petrified Forest National Park in Arizona were members of this family called Araucarioxylon arizonicum that grew to 200 feet before 200 million years ago.

What all these trees have in common, besides their common ancestry, is P.O. Boxes in the southern hemisphere. They are, in fact, all members of the “Antarctic Flora“, the remnants of the plant life that thrived on the ancient supercontinent Gondwana, the southern half of the former One-Continent-to-Rule-The-All Pangaea.

When Gondwana itself broke up, India and Africa headed northward, merged with the remnants of Laurasia (the northern half of Pangaea), and lost much of their Antarctic flora. Antarctica broke away from South America, became polar, and lost most of its plant life due to the persuasive presence of a crushing, miles-thick ice sheet.

But South America, Australia, New Zealand, and parts of Southeast Asia still contain plants that were all once part of the Antarctic Flora, despite their now-extreme distance from one another. Hence, the southern beeches (Nothofagus sp.) are found in South America, Australia, and New Zealand. The monkey puzzle tree is found in South America, the Kauri in New Zealand and the Norfolk Island Pine in the Pacific north of Australia and New Zealand.

Next time, we’ll talk about a huge, gorgeous, and startlingly beautiful family of living plants that was also part of the Antarctic Flora, and which most Northern Hemisphere dwellers have never seen before in their lives.

Jennifer Frazer About the Author: Jennifer Frazer is a AAAS Science Journalism Award-winning science writer. She has degrees in biology, plant pathology/mycology, and science writing, and has spent many happy hours studying life in situ.
Nature Blog Network
Follow on Twitter @JenniferFrazer.

The views expressed are those of the author and are not necessarily those of Scientific American.





Rights & Permissions

Comments 10 Comments

Add Comment
  1. 1. promytius 10:52 pm 06/30/2012

    wow – thanks.

    Link to this
  2. 2. Rock LeBateau 4:55 am 07/1/2012

    Cracking article Jennifer. Thankyou.

    Link to this
  3. 3. Jennifer Frazer in reply to Jennifer Frazer 4:08 pm 07/1/2012

    You’re welcome!

    Link to this
  4. 4. kdimoff 9:01 pm 07/1/2012

    so cool!

    Link to this
  5. 5. Michael Vnuk 10:09 am 07/2/2012

    The diameter you give for the giant kauri (43 feet) is closer to its girth (circumference). I’m not sure how the error crept in.

    http://register.notabletrees.org.nz/tree/view/800 gives the tree’s diameter as 4.916m (over 16 feet), which is still impressive. Its girth is 15.444m (over 50 feet).

    Link to this
  6. 6. Jennifer Frazer in reply to Jennifer Frazer 3:12 pm 07/2/2012

    I read the stats on the tree sign hurriedly and confused girth with diameter! Sorry for the mistake. I’ll fix it. Thanks.

    Link to this
  7. 7. Crasher 5:23 pm 07/2/2012

    I have a wollemi growing in a pot at my front door. I often look at it wondering how it was lucky enough to survive for so long in a changing world. Although I know little of biology I can still appreciate it.

    Link to this
  8. 8. Jennifer Frazer in reply to Jennifer Frazer 11:29 pm 07/2/2012

    I know. Thinking about that stuff makes my head spin too. I didn’t mention this in the post, but the few remaining individuals seem to be highly similar genetically, implying that at some point there was a bottleneck in which only one or a handful of plants survived. Thank goodness they did!

    Link to this
  9. 9. david smith 1959287 11:58 am 07/3/2012

    please can you tell me has there been any plants discovered since the wollemi that they found that they thought was extinct if so what were they and a brief info about them thants david smith

    Link to this
  10. 10. Jennifer Frazer in reply to Jennifer Frazer 11:39 am 07/9/2012

    I don’t know about *since* the Wollemi pine, but before the Wollemi pine was discovered, scientists described the dawn redwood from fossils in 1941 before they found it still alive in a small population in and around a temple in China in 1944. You can read a little more about it here.

    Link to this

Add a Comment
You must sign in or register as a ScientificAmerican.com member to submit a comment.

More from Scientific American

Scientific American Back To School

Back to School Sale!

12 Digital Issues + 4 Years of Archive Access just $19.99

Order Now >

X

Email this Article

X