Observation 129223: Trichaptum abietinum (Dicks.) Ryvarden

These were growing bracketlike on an old log, probably pine.
The largest one was about 8.5 cm across.
They were fairly tough and flexible.
Fertile surface was a reddish brown with thin teethlike structures ~ 2-3 mm long.
Spore print was pinkish. Spores were not amyloid.
Spores were ~ 7.2-9.0 X 6.0-7.3 microns, broadly ellipsoid and smooth.
Q(ave.) = 1.26.
Need help with these…
Edit 2-22-2013; Most likely the spores are not from the specimens themselves and that they are aged Trichaptum abietinum.

Proposed Names

-17% (2)
Recognized by sight
64% (4)
Eye3 Eyes3
Based on microscopic features: Spores don’t match though
47% (2)
Recognized by sight

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Can’t say
By: Gerhard Koller (Gerhard)
2013-02-22 13:37:00 CST (-0500)

that here. But I know from my stay in Sweden and Finland a few years ago that it was especially hard to distinguish between T. fuscoviolaceum and T. laricinum. Here it is clearly defined and no problem to tell them asunder properly. Besides, we only have two locations close at each other in Austria of T. laricinum, both made by me and a colleague in the Alps. Will post them at a later time when I come to this year. And what is called T. abietinum here does not look like this but has really almost angular pores with no laciniations or elongations. I do strongly believe that there are other Trichaptum species in America but no one has done proper research on them yet.

By: Irene Andersson (irenea)
2013-02-22 13:30:19 CST (-0500)

they are still pores, not lamellate at the margin, which is the main character that I heve learned to recognize in fuscoviolaceum.

Gerhard, you were talking about “borderline species” in another obs..
T. abietinum, fuscoviolaceum and laricinum are good representatives of that kind. They are extremely polymorphic and I’m frequently running into intermediates.

The pores
By: Gerhard Koller (Gerhard)
2013-02-22 11:38:12 CST (-0500)

look much more like fuscoviolaceum. Does that grow in America? Or is there a related species?
They do not really fit for abietinum, imo they are too gill-like which is characteristic for fuscoviolaceum. But could be because of corrupted state and old age.

Yes, I have to agree with Alan, Irene and Gerhard
By: Ron Pastorino (Ronpast)
2013-02-22 11:22:58 CST (-0500)

that these must be just old Trichaptums, most likely Trichaptum
abietinum(a very close relative of T. fuscoviolaceum).
Those spores just don’t seem right for any kind of Polyporales.
As Irene said, they likely came from somewhere else, maybe from the green algae that is more evident on the caps.
It is interesting on how many of those spores appeared to drop from the fertile surface of the specimens.

I would also go with
By: Gerhard Koller (Gerhard)
2013-02-22 05:54:01 CST (-0500)

What is the equivalent of European Trichaptum fuscoviolaceum in America?

The spores
By: Irene Andersson (irenea)
2013-02-22 02:09:00 CST (-0500)

are probably originating from an infection (mold, algae?).
I think that the polypore itself is too old to have kept any of its own spores.

Initially I also thought these might be
By: Ron Pastorino (Ronpast)
2013-02-22 00:03:49 CST (-0500)

Trichaptum abietinum since I found some later on the same trail. MO# 129222
But these had a pink spore print and completely different shaped spores(round/oval vs cylindric).

Created: 2013-02-21 23:16:56 CST (-0500)
Last modified: 2013-02-22 13:33:50 CST (-0500)
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