Summary:
Fibricium lapponicum is recognized by "fibrous skeletal hyphae together with encrusted cystidia". Features include 1) resupinate growth on wood, 2) cream to pale ochraceous smooth spore-bearing surface, and a fibrillose margin with small rhizomorphs, 3) spores that are elliptic, smooth, and inamyloid with oil droplets or inclusions, 4) cystidia that are numerous in some mature specimens, thick-walled, tapering to a blunt apex, encrusted when fully developed, and 5) a dimitic hyphal system, the skeletal hyphae fibrous and the generative hyphae with clamp connections.
It has been found in BC (Wells Gray National Park), Sweden, and Finland, (Eriksson).
Fruiting body:
resupinate, membranaceous; cream to pale ochraceous; mostly smooth; margin more or less fibrillose, with small rhizomorphs, which can also be found in the wood; in cross-section under a hand lens the hymenium-subhymenium and the subiculum are visible as two separate layers, (Eriksson)
Microscopic:
SPORES 6-6.5 x 3-3.5 microns, elliptic, smooth, inamyloid, thin-walled, with oil droplets or irregular oily inclusions; BASIDIA 4-spored, 25-30 x 5-6 microns, when young some may be longer (to 40-45 microns); CYSTIDIA few or rare when young, numerous in some mature specimens, 40-70 x 7-11 microns, "tapering to the obtuse apex, with thickened walls, encrusted when fully developed"; HYPHAE dimitic: generative hyphae 2.5-4 microns wide, thin-walled, richly branched, with anastomoses and with clamp connections, skeletal hyphae 1.5-2.5 microns wide, thick-walled, without branches and clamp connections, subhymenium "composed of densely joined generative hyphae, subiculum mainly of abundant skeletal hyphae"
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