Observation 309888: Corticiaceae sensu lato

On a barkless stump 1m tall and 30cm thick, perhaps tanoak. Covering large area (~40 × 30 cm) dry, cracked, thin (0.5 mm).

Most of the fruiting body is hymenium. Long 4-spored basidia, 60-85 × 7-8 intermixed with cystidia 130×5 (perhaps gloeo, though they don’t get very yellow in KOH). Spores round, 6-7 microns, inamyloid, with distinct apiculus. Subicular hyphae branched, 2.5-4.5 microns wide. Clamps rare at best.

Unsuccessfully tried to key it out in “The Corticiaceae of North Europe” and “Corticiaceae s.l. (Fungi Europaei)”.


Basidia, spores.
Basidia, cystidia, spores.
Subicular hyphae.
Basidia, two cystidia on the right.
Spores at 100×.
Spores in MLZ.

Proposed Names

28% (1)
Recognized by sight

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= Observer’s choice
= Current consensus


Add Comment
By: Ruzica and Sava Krstic (ruzasava)
2018-02-25 04:53:04 CST (-0500)

I did make a mount or two in Melzer’s, but there was no reaction. Just added the only photo in Melzer’s I have (of spores).

Do you have access to Melzer’s?
By: Django Grootmyers (heelsplitter)
2018-02-25 02:24:09 CST (-0500)