Summary:
Features include 1) resupinate growth on barkless conifer wood and wooden fences, 2) a thin, waxy, white spore-bearing surface that is smooth to tuberculate, 3) spores that are allantoid, smooth, and inamyloid, often with 2 oil droplets, 4) cystidia that are numerous, subfusiform with an apical head, with thin or slightly thickened walls, normally with an encrustation that easily falls off in the slides, and 5) a monomitic hyphal system, the hyphae thin-walled, richly branched and embedded in gelatinous matrix. Material from BC "agrees in microstructure but deviates in not having pure white fruitbodies (sordid in the herbarium)", (Eriksson).
It has been found in BC, ON, MN, and NY, (Ginns), as well as Sweden, Norway, and Finland, (Eriksson).
Fruiting body:
0.005-0.02cm thick, resupinate, closely adnate [firmly attached], orbicular [round] to confluent and spreading out mainly in the direction of the wood grain, ceraceous [waxy] and continuous, when dried crustaceous; white; smooth when young then more or less tuberculate, in older parts with small, mainly transverse cracks; margin "determinate or thinning out into a pruinose periphery", (Eriksson)
Microscopic:
SPORES 6-9 x 1.3-2 microns, allantoid, smooth, inamyloid, acyanophilic, thin-walled, often with 2 oil droplets; BASIDIA 4-spored, 20-30 x 3-3.5 microns, narrowly clavate, with basal clamp connection; CYSTIDIA numerous, 30-55 microns long, 5-6 microns wide at widest part, subfusiform with an apical head, with thin or slightly thickened walls, apical head 3-5 microns wide, "normally with an encrustation, which easily falls off in the slides"; HYPHAE monomitic: hyphae 2-3 microns wide, thin-walled, "richly branched and embedded in gelatinous matrix", "basidium-bearing subhymenial hyphae more or less volute, with marks from old, dissolved basidia", no subiculum, (Eriksson)
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