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Species Information
Summary: Features include 1) resupinate growth on decayed conifer wood, 2) soft fruitbodies that are whitish when fresh, the margin finely fibrillose under a hand lens, 3) spores that are suballantoid, smooth, amyloid, and colorless, 4) the absence of differentiated sterile hymenial elements, and 5) a monomitic hyphal system, the hyphae with clamp connections.
Amylocorticium cebennense has been found in BC, ID, NS, ON, AR, CA, and MA, (Ginns), and Europe (Eriksson). Collections were examined from BC, ID, AZ, CA, and MA, (Gilbertson).
Fruiting body: "annual, resupinate, developing in small patches or becoming confluent", "light buff" to "ivory yellow" to almost white; "smooth, cracking on drying to expose a loose, white subiculum"; "margin thinning out, whitish", loosely floccose to finely fimbriate [fringed]; subiculum with up to 4 strata, with light buff layers separated by darker zones, up to 0.05cm thick, "soft, loosely arranged, floccose", (Gilbertson), effused, more or less athelioid (like a loose pellicular membrane), soft; white when fresh, more light yellowish when dry; smooth; margin finely fibrillose under hand lens, with no rhizomorphs, (Eriksson)
Microscopic: SPORES 6-7.5 x 2-2.5 microns, cylindric to suballantoid, smooth, amyloid, colorless, thin-walled, collapsed in dried specimens; BASIDIA 4-spored, 20-30 x 4.5-5.5 microns, narrowly clavate, with basal clamp connection; CYSTIDIA and other sterile elements absent; HYPHAE monomitic; SUBICULAR HYPHAE 3-5 microns wide, colorless, thin-walled to firm-walled, "with conspicuous clamps at all septa, with frequent branching, typically branching from clamps", (Gilbertson), SPORES 6-7.5 x 2-2.5 microns, allantoid, smooth, amyloid, with one or two droplets; BASIDIA 4-spored, 25-30 x 4-6 microns, narrowly clavate, with a basal clamp connection; subhymenium distinct as fruitbody thickens; HYPHAE monomitic, with hyphae 3-4 microns wide, loosely interwoven, rather straight, with clamp connections at all septa, the branches occurring almost exclusively from the clamp connections, (Eriksson)
Habitat / Range
on Abies balsamea (Balsam fir), Arbutus menziesii (Pacific Madrone), Larix occidentalis (Western Larch), Pinus monticola (Western White Pine), Pinus ponderosa (Ponderosa Pine), Thuja plicata (Western Red-cedar), associated with a brown cubical rot of dead wood, (Ginns), on decayed conifer wood (fallen trees, slash, fencing), rarely on hardwood, (Eriksson)
