one fruiting body
Habitat: Green ash (Frax pen) living still, riparian forest

Note the pores stuffed with the white hyphae, meaning Phellinus (not Fomes fomentarius). The small size suggests P. tremulae, though Arora says it grows on aspen I’m assuming other hardwoods (here ash) are also possibilities.

Later (May 2, 2014)
I tested the dried specimen with 5% KOH solution. The darkening agrees with Phellinus for an ID. see pics added

Species Lists


pores with white hyphae stuffed inside, obviously perennial (4? layers here)
cracked top
pores underside
immediately after applied KOH (left) and control water (right)
after about 15mins under the fume hood (KOH on left, water on right)
before KOH

Proposed Names

30% (3)
Recognized by sight: cracked black cap surface, yellow brown pores, black with KOH but not the hoof shaped conk of P. tremulae which is apparently host specific to aspen aka aspen conk
30% (2)
Recognized by sight: occurs on many hardwoods including ash
Used references:
61% (2)
Recognized by sight: On green Ash. KOH black. Pore size larger than Phellinus.

Please login to propose your own names and vote on existing names.

= Observer’s choice
= Current consensus


Add Comment
Perenniporia fraxinophila
By: Chris Hay (hayfield)
2015-04-15 18:09:44 CDT (-0400)

Thanks, Erlon! This ID makes a lot of sense. I’m surprised such an old observation was returned to, so thanks -

Judi: glad you found this useful. I still find conks baffling, so I need to note everything I can when trying to ID. Looking forward to this field season, but will be focusing on grassland fungi (no wood) this year.

My “before KOH” image uploaded the same as an “after KOH” one – I deleted and uploaded the proper photo… it got turned and MO won’t let me rotate but you get the idea.

Chris, all your photos and descriptions
By: Judi T. (AvidAmateur)
2015-04-14 16:08:16 CDT (-0400)

are extremely helpful for those of us trying to learn more about a variety of conks. Thanks for taking the time to document your “find” so thoroughly.

aspen specificity
By: Chris Hay (hayfield)
2014-05-02 22:59:03 CDT (-0400)

@pinonbistro with Phellinus igniarius ID
Thanks for those resources, probably not P. tremulae then. I wonder which Phellinus like ash… Anyway, I’ll be looking at aspen shelves a lot closer from now on.