Observation 21194: Phellinus tremulae (Bondartsev) Bondartsev & P.N. Borisov

When: 2009-05-21

Collection location: Forest near Elgin St., Pembroke, Ontario, Canada [Click for map]

Who: Paul Derbyshire (Twizzler)

No specimen available

A dying tree along the 200m section of trail I’ve nicknamed the “Miracle Mile” hosts these. I hadn’t bothered to take a close look before, but decided today to get some decent photos, some by using new tricks. I got eight good ones.

First photo: Image thumbnail, cropped from third photo.
Second photo: Top of the doomed tree. No fruitbodies visible.
Third to fifth: Tree trunk with conks, increasing closeups. First two from same spot with second using telephoto. Third another group of conks from another angle.
Sixth to ninth: A particular conk — whole, closeup of underside near trunk, closeup of rim with tree and cracked, wrinkled top in focus, and closeup of rim with rim and part of undersurface near rim in focus.

Edit, June 11: attempted to get more detailed shots of the underside, with partial success.

A new mushroom group was growing on the same tree: http://www.mushroomobserver.org/22101

Edit, June 23: added four more photos of the underside, better than June 11’s.

Edit, March 7 2010: this sucker is definitely perennial. Same fruitbody, nearly a full year later. Whether it stays fertile that long I don’t know, but the conk sure seems to persist year-round.

Proposed Names

9% (2)
Recognized by sight
77% (3)
Recognized by sight: Not birch! The tree is aspen, or at least som kind of poplar..

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= Observer’s choice
= Current consensus


Add Comment
By: Joseph O'Brien (vaprwere)
2009-06-29 16:44:15 -03 (-0300)

The tree is an aspen (Populus tremuloides). I agree with Tom that some of the sporocarps don’t present in the normal P. tremulae fashion, but others in the set do look like typical sporocarps of this fungus.

Tree species
By: Paul Derbyshire (Twizzler)
2009-05-28 02:54:00 -03 (-0300)

I’ve been making an effort to more precisely identify the tree species around the area. Besides paper birch there seems to be a stand, in one area, of what might be quaking aspen instead, which has white bark.

I don’t suppose there’s a treeobserver.com that can ID trees from photos? The resources online for tree identification that I found are shockingly paltry and often primitive. A series of rows of name, leaf photo, twig-with-leaves photo, flower photo, fruit photo, young bark photo, old bark photo, young tree photo, and old tree photo would be useful, and none has this structure that I found, or an interactive system like MO uses for mushrooms.

By: Tom Volk (TomVolk)
2009-05-27 23:19:38 -03 (-0300)

I agree that this does not look like a white birch. Do you have other species of birch in your part of Ontario? Like gray birch? It looks more like aspen to me, but the fungi do not have the aspect of Phellinus tremulae— they stick out way too much. In any case great pictures with the telephot lens!

You sure?
By: Paul Derbyshire (Twizzler)
2009-05-24 23:07:53 -03 (-0300)

You sure? White bark, stature and leaves, etc. and the whole area is mainly birch/pine/spruce mixed…

Created: 2009-05-21 22:59:46 -03 (-0300)
Last modified: 2009-05-21 22:59:46 -03 (-0300)
Viewed: 701 times, last viewed: 2019-03-19 10:28:16 -03 (-0300)
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