Observation 146634: Ischnoderma resinosum (Schrad.) P. Karst.
When: 2013-09-27
Collection location: Hayden, Idaho, USA [Click for map]

Proposed Names

-20% (4)
Used references: Arora, Mushrooms Demystified.
29% (4)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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By: Lepkaun (Lepkaun)
2013-10-10 16:46:41 CDT (-0500)

This mushroom was quite fuzzy/hairy.
Sorry about the blurry pic.
Underside was whitish color.

By: Daniel B. Wheeler (Tuberale)
2013-09-29 11:56:15 CDT (-0500)

MO 146703 from Virginia to
MO146634 from Idaho:

One has central depression with sporocarp climbing upward and outward;
one has central attachment, with sporocarp climbing downward and outward.

By: Drew Parker (mycotrope)
2013-09-28 00:54:03 CDT (-0500)

The fact that this image is out of focus/blurred makes it look more hairy than it is. I wouldn’t call Ischnoderma hairy at all. They are finely tomentose at first and become smooth or even partly glossy in age.

There is nothing in Arora that says Ischnoderma is hairy.
By: Daniel B. Wheeler (Tuberale)
2013-09-28 00:12:39 CDT (-0500)

But Lincoff says “Large, flattened, hairy, brownish, stalkess cap with thick margin and whitish pores.” He also says “…becoming smooth at maturity, sometimes concentrically furrowed; often with dark, shiny, crusty, resinous zones, often radially wrinkled.” Lincoff further states “Flesh 1-2.5 cm thick…”

Are we dealing with different species here?

By: Daniel B. Wheeler (Tuberale)
2013-09-27 23:51:46 CDT (-0500)

It may be “shelflike or bracketlike”; when young it could be “watery at first, and often exuding droplets, especially near margin of cap”, and “exude droplets of liquid (especially when young or in wet weather).” It is often “5-30 cm broad…”. It is a “roughened, resinous, dark brown to blackish, shelflike fruiting body.” Quoted from Mushrooms Demystified.

No mention of it being conk-like, although the flesh can be “1-3cm thick”.

This observation doesn’t look thick. But it does look conk-like. The top of the specimen is much higher than the bottom.

T. hirsuta, in the absence of evidence of flesh thickness, seems possible. I can see abundant hairs on the cap.

T. hirsuta…
By: Drew Parker (mycotrope)
2013-09-27 22:15:06 CDT (-0500)

may be right for size, but it would be much paler than this. These rich, brown colors and blackish banding are spot on for Ischnoderma.

By: Daniel B. Wheeler (Tuberale)
2013-09-27 14:27:39 CDT (-0500)

Naming this fungus is determinate by size. Trametes versicolor is 2-7 (10) cm broad, or usually 3 inches maximum. Trametes hirsuta (hairy top) is between 2.5-15 (30) cm, or up to 10 inches across. You haven’t suggested how large this specimen was, but I suspect (given the log underneath) it is T. hirsuta.

the underside
By: else
2013-09-27 13:26:57 CDT (-0500)

of any mushroom can give a lot of information – colour, shape, pores, lamellae – next time, could you please also take a picture of the other side?
thank you!

Created: 2013-09-27 13:08:27 CDT (-0500)
Last modified: 2013-10-11 13:54:07 CDT (-0500)
Viewed: 70 times, last viewed: 2017-06-22 17:12:05 CDT (-0500)
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