Tuesday, 28 April 2015

A Teratological Mystery from 1744: Agaricus ramosus/Boletus ramoso/Boletus rangiferinus/Polyporus squamosus

Ehret Agaricus ramosus or abnormal growth of Polyporus squamosus
Georg Dionysius Ehret's 1744 illustration
of "Agaricus ramosus"
I was leisurely poking around the Wellcome Library's astonishing collection of hi-res historical images when I was stopped in my tracks by this fabulous, otherworldly image of a fungus. What the heck is it supposed to be? 

My first thought was that it was either a poor rendering, or something invented. But the man who made this hand-painted engraving was no slouch. In fact, he was one of the most celebrated botanical illustrators of his time: Georg Dionysius Ehret. Born in Germany in 1708, Ehret began his career as a gardener at a local castle. But he also studied and drew plants and insects with enough detail that before he was thirty he was already collaborating in Holland with Carl Linnaeus in the production of the important botanical work, Hortus Cliffortianus. Eventually he moved to London where he specialized in illustrating the numerous exotic plants that were regularly being brought to England from the colonies. He was lauded not just for his style, but also for his anatomical accuracy in rendering these plants.

Ehret Selenicereus gradiflorus 1750 from Plantae selectae
Ehret's 1750  illustration of Selenicereus
from Plantae selectae
Though he rarely depicted fungi, it's obvious that Ehret knew what he is doing. Which means we have to assume that the illustration of the antlered fungus must be a fairly faithful rendering of what was found growing in Mr. Winckles’ cellar.

Helvella mitra water-colour by Ehret
Ehret's 1760 watercolour of "Helvella mitra"—a rare, for him, rendering of a fungus.

But What the Heck Is It?

Ehret's description of Agaricus ramous Ployporus squamosus
Close-up of Ehret's description of Agaricus ramosus
Though called "Agaricus ramosus," the fungus depicted is clearly not an Agaricus of any kind, certainly not as we now know the genus; Agaricus species all have gills, and Ehret clearly states—and shows—that this “plant” has pores. Of course, 1744 was early days in terms of fungal taxonomy and, at the time, the name Agaricus was widely applied to many fungi, including polypores. 

With no other clues, I Googled "Agaricus ramosus" to see what would happen. The first page of hits turned up nothing other than reproductions of the same illustration—no help at all. Mycobank was also no help, nor, surprisingly, was Index Fungorum, the international index of formal fungi names. I plowed on and eventually found reference to Ehret's fungus in a 1745 issue of The Royal Society’s Philosophical Transactions, a copy of which, despite being 270 years old, was easy to find (I can't tell you how much I love the World Wide Web!):

"An Account of a New Species of Fungus by John Martyn [professor of botany, Cambridge] communicated in a Letter to the President:

“In the latter Part of the Summer of the Year 1744, Mr Ehret the Painter brought me a Fungus of a very extraordinary Shape and Size, which had been found growing on a Piece of the Trunk of an Elm, in a damp Cellar in the Hay-Market.

“The whole Plant was about two Feet in Height; and, at first Sight, seemed not very unlike the Horns of some Deer, being variously branched, and covered with a thick Down. It was of a spongeous Substance, and of a dusky-red Colour inclining to Black. The Tips of the smaller Branches were of a Cream-Colour. The larger Branches or rather the Tops of the whole Plant, were expanded in Form of a Funnel, smooth on the concave, and full of Pores on the convex Side. The inner and lower Part of the Funnel was of the same Colour with the Stalk; the rest of it was of a cream-Colour.

“I have not been able to find, that this Plant has been mentioned by any Author: and I am persuaded, that it is a new Species; and, perhaps, the remarkable branching of the Stalks may induce some to think it a new Genus..." 

Martyn, however, goes on to decide that it is not a new genus, and, because its cap is not lamellated, he makes it a Boletus, settling on the name Boletus ramoso—a name that goes absolutely nowhere on the internet.

But then I discover that Ehret’s image had been listed in a library catalogue as Boletus rangiferinus, a name James Bolton came up with in 1888 after being shown what he described as a 

"curious and extraordinary fungus growing on a Log of Wood, in the cellar of a Publick House in Leeds, in the beginning of October...I had an opportunity of drawing it when fresh and newly gathered, but it is in the possession of a Man, of such a temper (who is no Naturalist) that no offers I could make him would prevail him to part with it!" 

I typed Botetus rangiferinus into Google...

...and Suddenly Everything Falls into Place

It turns out that this bizarre antlered fungus that grows in dark, dank cellars, descriptively named Agaricus ramous and Boletus ramosa and Boletus rangiferinus (ramose=branched and rangifer=reindeer), is none other than—drum roll, please—an abnormal, or teratological form of the extremely common, cosmopolitan wood decayer, Polyporus squamosus, aka Dryad's Saddle (a name that goes back hundreds of years) or Pheasant's Back (a 20th century name). Whatever you prefer to call it, P. squamosus apparently does very peculiar things in the dark. 

Edible Polyporus squamosus, Pheasant back, Dryad's saddle
Perfectly normal Polyporus squamosus growing on a standing dead elm
There are other descriptions of this "cellar fungus" "monstrosity" to be found on the internet. According to an article in the The Midland Naturalist (1888), one was found in a wine cellar with a 

"dark coloured base about six inches wide, and from this arose a number of clavaria-like processes, some of which were branched. These clavaria-like branches were from three to six inches long, and were of a pale fawn colour." 

Another, smaller example, was found growing in the rafters of a house when a floor was removed for repairs.

And then I found another illustration of the antler deformity, this one by James Sowerby in English Fungi or Mushrooms (1797). That sure looks like an antler to me.

mutant mushroom Polyporus squamosus  James Sowerby, English Fungi or Mushrooms (1797)
A clearly depicted Polyporus squamosus "antler" by
James  Sowerby in English Fungi or Mushrooms (1797)
One can hardly blame those who saw these "antler" growths to think they'd stumbled across an unnamed species. I would probably have thought the same thing, particularly since the first time I found baby P. squamosus—having only seen large mature ones before—I initially didn't have a clue what they were...and they weren't even sporting black antlers. But I'd like to see the "clavaria-like" form, so I have a mind to take a chainsaw out back and cut a piece off a productive dead elm to put in my root cellar to see if I can grow my own teratological P. squamosus formation. 

Young Dryad's saddle, pheasant's back, Polyporus squamosus
Polyporus squamosus "buttons" can be confusing to the uninitiated.


Georg Dionysius Ehret on Wikipedia
An Account of a New Species of Fungus by John Martyn, The Royal Society’s Philosophical Transactions 1745
W. B. Grove. A Cellar Fungus,The Midland Naturalist (1888)
"Mutation Collection" of fungi on Mushroom Observer

Polyporus squamosus on the web:

First Nature
Some cooking tips on Mushroom-collecting.com

Friday, 10 April 2015

Googly Eyes on Dogwood: Schizoxylon alboatrum

Schizoxylon alboatrum ascomycete looks like tiny eyes

For a few weeks now, people all over the internet have been ecstatically posting pictures of their first morels of the year—people who obviously don't live in central Ontario. No morels here. Here there's still plenty of snow in the woods, so I don't expect any Morchella to poke up for at least another couple of weeks. But who cares? Even when I'm still wearing my winter scarf and earmuffs I can find even better things than morels. Well, not better for eating, I admit, but better in the weirdness department. Things like what I found in the alder swamp yesterday: I picked up a long-dead dogwood (Cornus sp.) twig to look at it more closely and it was staring back at me. It was covered in tiny, protruding, ascomycete eyeballs.

1mm tiny ascomycete Schizoxylon alboatrum
Schizoxylon alboatrum fruiting bodies are erumpent and .05-1.0 mm in diameter.

The minute, fuzzy whitish apothecia with shiny black "pupils" were nothing like anything I'd ever seen before—not in real life, not in any book I own, and not on any website. 

Schizoxylon alboatrum erupts through bark
Schizoxylon alboatrum are erumpent—a word that
makes me happy. They erupt through bark.
Schizoxylon alboatrum black centres, fuzzy white
Dried out, Schizoxylon alboatrum look less like eyes and more like
the coconut liquorice allsorts everybody eats last.

I hoped that a bit of work with the microscope might be illuminating, so I sectioned one and had a look. I was, I admit, totally perplexed by what I was confronted with: a bunch of hairs with multiply split ends. It took a few minutes to figure out that the hairs I was looking at were actually extremely long and slender asci (350-400 x 7-8 ┬Ám), and the "split ends" were the equally long ascospores working their way out. 

Schizoxylon alboatrum asci, ascospores, paraphyses
Asci, ascospores, and paraphyses all look hairy.

I got on the computer and started googling "filiform ascospores" hoping I'd get lucky. I didn't. My backup at times like this is to go first to the back pages of Fungi of Switzerland: Volume 1 (Ascomycetes), where all the real oddities reside, but the only characters with filiform ascospores did not have fruiting bodies that even vaguely resembled my little "goggly eyes." Which meant I had to go page by page through the asci and spore illustrations in Ellis & Ellis's Microfungi on Land Plants. Finally, on Plate 118, I found a couple of possible genus names to investigate, Stictis (illustration #1243) and Schizoxylon (illustration #1242). 

After another two hours of internet work, I had a name: Schizoxlyon alboatrum. The species epithet is a simple descriptive—albo meaning white, and atrum being black. 

Schizoxylon alboatrum and filiform ascus and spores
A clutch of the incredibly long ascospores of Schizoxylon alboatrum.

I've found reference to it being rare or uncommon, but I don't know if that's true. Maybe if all the people out looking for morels were also keeping an eye out for wee characters like these, we'd find out that they're actually more common than suggested. What's indisputable, though, is that, edibility-wise, they are "without interest"—at least for humans.


The genus Schizoxylon, key & descriptions: Martha A. Sherwood, The Ostropalean Fungi, Mycotaxon 5 (1), 1977. 108-

Schizoxlyon alboatra on MycoDB 

and on Ascofrance