Observation 211313: Fomitopsis P. Karst.

When: 2015-07-24

Collection location: Lubec, Maine, USA [Click for map]

Who: Terri Clements/Donna Fulton (pinonbistro)

No specimen available


Proposed Names

1% (2)
Recognized by sight: Cap 3cm. pale brown with whitish fibrils, tiny cream irregular pores, 2 mm tubes, rudimentary stem color of cap with brown scales and white cottony mycelium, thick firm white flesh (fleshy not corky or woody), mild taste, off odor, on dead conifer,
Based on chemical features: KOH negative on flesh
57% (1)
Recognized by sight
20% (3)
Recognized by sight
44% (2)
Recognized by sight: P. betulinus is host specific to birch and is reported to have a nice mushroomy odor and bitter taste. It also occurs in the fall with the start of chilly nights. Of the remaining species in Piptoporus P. quercinus is only on oak, P. soloniensis on hardwood, and P. roseovinaceus has a wine colored cap

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= Observer’s choice
= Current consensus


Add Comment
By: walt sturgeon (Mycowalt)
2016-05-03 21:33:07 PDT (-0700)

Index Fungorum has only 2 species. I do not know a good resource. I do know that species sometimes occur on unusual hosts. For example, I have found Ganoderma tsugae on birch.

Walt, can you send me a link to info on Piptoporus species
By: Terri Clements/Donna Fulton (pinonbistro)
2016-05-03 20:19:22 PDT (-0700)

other than betulinus? From what I’ve read many have been moved to other genera. I couldn’t find detailed descriptions of those that remain.


Sure looks like P. betulinus
By: Terri Clements/Donna Fulton (pinonbistro)
2016-05-03 20:08:03 PDT (-0700)

but I just couldn’t bring myself to call it that when this obs had mild taste, unpleasant odor, and occurred on a conifer as opposed to the birch polypore which has a bitter taste, pleasant odor and occurs on birch.


Piptoporus betulinus ’shouldn’t’ grow on conifer
By: Martin Livezey (MLivezey)
2016-04-29 18:48:46 PDT (-0700)

But I’ll bet sometimes it gets started in lichen and bark and then just gives it the ole’ college try. That’s what it looks like, and it matches your description. I have seen it on many birches within feet of conifers. The certainly know each other.

Danny, Piptoporus was my first thught
By: Terri Clements/Donna Fulton (pinonbistro)
2015-07-26 13:42:59 PDT (-0700)

because it looks so much like P. betulinus which it seems grows only on birch. I can find no information on the other species in Piptoporus.