On downed madrone. Context soft, watery when collected. Spore print not obtained. KOH+, purple.

Species Lists


Proposed Names

28% (1)
Recognized by sight
45% (2)
Recognized by sight
28% (1)
Recognized by sight: I don’t know mushrooms

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

= Observer’s choice
= Current consensus


Add Comment
By: Danny Newman (myxomop)
2016-01-10 21:40:49 PST (-0800)

is what Jonathan Frank (x{NAME jonagus }{ User jonagus }x) was calling this whitish polypore on Madrone. I am inclined to believe him (The Ceskas would appear to agree as well), but Fungi Europaei 10 Polyporaceae s.l. by Bernicchia lacks any mention of a KOH reaction. Indeed none of the Antrodia descriptions save for A. alpina make any mention of a spot test KOH reaction. Oversight or significant difference?

EDIT: It’s all coming back to me…

I do have a dried specimen
By: Trent Pearce (trentpearce)
2015-03-19 16:53:12 PDT (-0700)

…and would be happy to share it with someone whose microscopy skills are above mediocre. I can also revisit the site (at some point) to determine the type of rot on the host log, but I also remember the log being mostly intact.

this looks like the very same thing I just found at Huck last week …
By: Debbie Viess (amanitarita)
2015-03-16 07:45:50 PDT (-0700)

on dead madrone.

the madrone was still mostly intact.

I didn’t collect it, altho I do have a photo.

By: Danny Newman (myxomop)
2015-03-15 22:46:43 PDT (-0700)

can you revisit this and find out whether the host is brown-rotted or white-rotted? this will be pivotal in arriving at an ID. micro is even more important, but this requires having a dried specimen, which does not exist according to the observation notes.

you’re right
By: Danny Newman (myxomop)
2015-03-14 14:51:09 PDT (-0700)

red then black in P. fulgens, cherry red in P. alboluteus. i would say this is neither, and there aren’t exactly very many other species in the genus to choose from.

time for micro and a species list to accommodate KOH spot-tested polypores with non-xanthochroic color reactions.

By: Christian (Christian Schwarz)
2015-03-14 14:43:52 PDT (-0700)

Less than a minute. Only thing I have to add is an aimless wondering:
doesn’t Pycnoporellus turn red in KOH?
Variably listed as conifer-restricted or not.
I am out of things to say.

By: Danny Newman (myxomop)
2015-03-14 14:40:55 PDT (-0700)

owe me a coke

KOH purple, texture
By: Christian (Christian Schwarz)
2015-03-14 14:39:19 PDT (-0700)

isn’t Hapalopilus usually pretty soft? I don’t think that’s what this is, just not sure that the texture rules it out.

Also, the original description mention ochraceous to light brown colors (paler but in the general area of Trent’s mushroom), while their image shows something strikingly pinkish. They don’t mention anything about KOH reaction at all (or did I miss it?).

“More material is needed
By: Danny Newman (myxomop)
2015-03-14 14:38:26 PDT (-0700)

to describe the extent of macroscopic variation in this species." -

Maybe the collectors/authors never KOH spot tested fresh material… There’s also the “ochraceous to light brown” pileal coloring and “coarsly rugose” pileus texture to contend with, neither of which I see here.

the purple spot test reaction to KOH
By: Danny Newman (myxomop)
2015-03-14 14:33:50 PDT (-0700)

is or is not an indication of the presence of polyporic acid, which, according to this excellent article by Mike Beug, is present in at least this many fungi:

Hapalopilus nidulans (=Hapalopilus rutilans)
Porostereum friesii (=Hjortstamia friesii)
Lopharia papyraceae
Phanerochaete filamentosa (=Rhizochaete filamentosa)
Poria sp.

Whereas these species exhibit a similar reaction (deep orange, red, pinkish red or purple), the either do not have poylporic acid or have not yet been conclusively proven to contain polyporic acid, at least not at the time of writing:

Fomes fomentarius
Hapalopilus albocitirnus
Hapalopilus mutans
Hapalopilus croceus
Hapalopilus sibiricus
Ceriporia purpurea
Albatrellus skamanius

For the purposes of this observation, we needn’t really be concerned with whether polyporic acid is or isn’t responsible for the color change observed here. What’s important is that KOH induced a color change, period. This is not any of the Hapalopilus species I am familiar with, and perhaps not a Hapalopilus at all given the soft consistency you report. I’d just about rule out everything but Poria from that list.

In skimming through The Poroid Fungi of Europe I see one Antrodia listed as having this reaction, A. alpina, which is said to be widespread in North America, but occurs on dead conifers.

What we really need is a polyporologist.

I give up on this thing…
By: Trent Pearce (trentpearce)
2015-03-14 13:41:33 PDT (-0700)

…however, I am open to constructive suggestions.

This is the description of A. madronae
By: Danny Newman (myxomop)
2015-03-12 20:14:59 PDT (-0700)

which makes no mention of a spot-test reaction to KOH, nor of such a light colored basidiocarp.