Collection location: Henry Cowell Redwoods State Park, Santa Cruz Co., California, USA [Click for map]
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)”.
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sum(score * weight) /
(total weight + 1)
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).