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Species Information
Summary: Features include 1) resupinate growth on conifer wood, 2) yellowish color when young, remaining yellowish when old, 3) a smooth to slightly tuberculate surface, 4) a margin that is fibrillose under hand lens, concolorous or whitish, 5) narrowly cylindric, amyloid spores, 6) cylindric cystidia, and 7) a monomitic hyphal system with clamp connections, 8) sections showing alternating layers, and 9) sections in Melzer''s reagent showing brown globules.
Amylocorticium subsulphureum is found in BC, ID, AB, MB, NS, PQ, AR, AZ, MD, MN, MT, NM, and NY, (Ginns). It is also found in Sweden (Eriksson). Collections examined from AZ, MD, and MT, (Gilbertson).
Fruiting body: effused, adnate [tightly attached], quite soft; yellow; smooth; finely fibrillose, (Eriksson), yellowish to cream-colored, (Martin), "annual, resupinate, becoming widely effused, soft"; yellowish ("naphthalene yellow" to "mustard yellow") when fresh, becoming "pinkish buff" to "pinkish cinnamon" when dried; "smooth to slightly tuberculate, often cracking into small angular blocks on drying"; margin abrupt to thinning out and finely fimbriate [fringed], colored as the rest of the surface to whitish; subiculum appearing stratose [layered] under 30x lens with 2-3 darker zones separated by paler pinkish buff tissue, soft, to 0.05cm thick, (Gilbertson)
Microscopic: SPORES 5-7 x 2-2.5 microns, subcylindric, smooth, amyloid, with slightly thickened walls; BASIDIA 4-spored, about 25 x 4-5 microns, narrowly clavate, with basal clamp connection; CYSTIDIA 60-90 x 4-6 microns, "slightly differentiated and hyphae-like, smooth, sometimes with a clamped septum"; subhymenium develops as fruitbody thickens; HYPHAE monomitic, with rather straight hyphae, clamp connections at all septa, branching mostly from the clamp connections, (Eriksson), SPORES 5-6.5 x 1.5-2 microns, narrowly cylindric, slightly curved; CYSTIDIA abundant, cylindric, (Martin), SPORES 6-8.5 x 2-2.5 microns, "cylindric, straight to slightly curved", smooth, amyloid, colorless; BASIDIA 4-spored, 21-27 x 5-6 microns, clavate, with basal clamp connection; CYSTIDIA "scattered, cylindric to narrowly clavate, thin-walled, not incrusted, rarely with clamps, 40-90 x 4.5-5.5 microns, arising from the subiculum and partially imbedded, projecting to 30 microns, with a basal clamp"; HYPHAE monomitic, SUBICULAR HYPHAE 2.5-4.5 microns wide, colorless, thin-walled, with conspicuous clamp connections on all septa, with frequent branching, typically branching from clamp connections or adjacent to the septum opposite a clamp connection, "sections in Melzer''s reagent with copious brownish, oily globular material", (Gilbertson)
Habitat / Range
on coniferous wood, usually free from bark, (Eriksson), on decaying barkless wood; on log; on Abies sp., Larix occidentalis, Picea, Pinus spp.; associated with brown cubical rot, (Ginns), white rot (Martin)
Similar Species
Amylocorticium subincarnatum is closely related: it becomes tinged reddish when old, tends to be larger, and has different spores (although the spores of A. subsulphureum vary considerably even in the same fruiting body, leading to some uncertainty about the distinctness of the two species), (Eriksson). A. subincarnatum looks like A. subsulphureum but has shorter, more elliptic spores and cystidia with more frequent clamp connections, (Gilbertson). A. subincarnatum has narrowly elliptic spores flattened on one side, 4-5.5 x 2-2.5 microns, while A. subsulphureum has narrowly cylindric, slightly curved spores, 5-6.5 x 1.5-2 microns, (Martin).
