Observation 310642: Polyporales sensu lato

Growing on the cut side as well as on the bark of a 30cm thick log, coast live oak or tanoak. Peels off when fresh with a little effort, tenacious. Trama is white, like styrofoam when dry; the hymenial layer is pigmented, quite hard when dry.

Basidia 4-spored 16-18 × 4. Strangely, I couldn’t see any spores in several preparations, except for a couple of non-discharged ones. The larger of those measures 3.5 × 3 (which only gives us a lower bound). No enclosed hymenia observed, only hymenial. Subhymenial layer gelatinous with hyphae 2-3 microns wide. Tramal hyphae have thicker walls and are about 2 microns wide. Basidia and hyphae both clamped. No color reactions in Melzer’s.


Basidia and an immature spore.
Basidia and an immature spore.
Cystidium with basidia.
Gelatinous subhymenial layer.
Gelatinous subhymenial layer.
Tramal hypahe.
Groups of crystals abundant.

Proposed Names

-13% (2)
Recognized by sight
-31% (2)
Recognized by sight: Spores are off but otherwise this is a decent match
28% (1)
Recognized by sight

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= Observer’s choice
= Current consensus


Add Comment
Doubting dichrous
By: Ruzica and Sava Krstic (ruzasava)
2018-03-02 02:02:50 CST (-0600)

Thanks, Django, but the spores in G. dichrous are allantoid — a shape into which these two immature spores in my photos can not grow. They are already twice as wide as the dichrous spores.