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Species Information
Summary: Features include 1) resupinate growth on wood, 2) a cobwebby to cottony fruitbody that is dull green to yellowish green, the surface smooth to warted or toothed, often faintly punctate, the margin irregular and almost white, and the subiculum also paler than spore-bearing area, 3) spores that are round to nearly round, verrucose to aculeolate, pale citrine to yellow in water, and usually purple in 2-3% KOH, 4) subicular hyphae that are colorless to slightly citrine (often purple in KOH), with clamp connections, 5) presence of cordons.
Amaurodon viridis has been found in BC, ID, AZ, CA, MO, MN, NY, PA, and VT, (Ginns(5)), and Czechoslovakia, France, Netherlands, Russia, United Kingdom, Tunisia, Australia, and New Zealand, (Larsen).
Fruiting body: up to 0.03cm thick, separable, arachnoid [cobwebby] to byssoid [cottony], "somewhat pelliculose in mature portions", spore-bearing areas mostly continuous; dull green to yellowish green; "smooth to warted or toothed, often faintly punctate"; sterile margin irregular, paler than the spore-bearing area, "almost white, arachnoid, becoming fibrillose"; subiculum thin, arachnoid, paler than the spore-bearing area, (Larsen)
Microscopic: SPORES 5-6 microns in diameter, round to nearly round, verrucose to aculeolate, pale citrine to yellow in water, usually purple in KOH; BASIDIA 4-spored, 20-35 x 5-7 microns, clavate, with clamp connection at base, sterigmata up to 5 microns long; SUBHYMENIAL HYPHAE 2.5-3.5 microns wide, colorless, thin-walled, with clamp connections; SUBICULAR HYPHAE 2.5-4 microns wide, colorless to slightly citrine (often purple in KOH), thin-walled or with some thickening apparent, with clamp connections; CORDONS 5-30 microns wide, citrine to pale brown, individual hyphae 2-3 microns wide, thin-walled, with clamp connections, (Larsen), spores of Amaurodon species staining violet to dark blue in 2-3% KOH, (Ginns(23))
Amaurodon mustialaensis has nearly smooth spores and a smooth to grandinioid surface, (Ginns(23)). Tomentella species recorded from the Pacific Northwest (except Tomentella crinalis) have larger spores, and their ornamentation tends to be more prominent, while T. crinalis has a dimitic hyphal system, (Larsen).
