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Species Information
Summary: Antrodiella semisupina is characterized by its dense semitranslucent texture and small pores and spores. Other features include its thin narrow shingled caps that are white and velvety at first becoming ocher to pale straw-colored, bald, and slightly zonate, its pore surface that is cream to pale straw-colored at first, its mild taste, and growth usually on hardwoods but also on other polypores or conifers. It is common in the east, but rare in the Pacific Northwest, (Gilbertson). The type seems to represent a different species from what is usually called Antrodiella semisupina, (Miettinen(1)).
Antrodiella semisupina has been found in BC, OR, ID, NB, NS, PQ, CT, MA, MI, MT, NH, NJ, NY, PA, TN, VA, and VT, (Gilbertson).
Cap: usually bracket-like or bent outward from pore surface on wood to form shelf-like cap, rarely entirely flat on wood, usually small, often imbricate [shingled] with many narrow caps, and fused laterally, individual caps rarely more than 2cm wide, up to 0.4cm thick at base, flat specimens up to 0.5cm thick, "soft and waxy when fresh, dense and cartilaginous or resinous when dry and often semitranslucent, partly loosening along the margin when dry", margin sharp and bent down in capped specimens when dry, in the parts flat on wood margin white to cream, and often slightly fimbriate (fringed); cap surface at first white becoming ochraceous to pale straw-colored; at first azonate and appressed velvety, when old becoming bald, slightly zonate, sometimes with some radial lines, (Gilbertson), growing flat on wood with pore surface exposed, or forming caps that are fan-shaped to conchate, 0.5-2cm along wood, projecting 0.5-1.5cm, 0.1-0.3cm thick, constricted and rather stem-like toward the attachment on wood; cream to yellowish; slightly undulating, smooth, "almost translucent and with slight concentric zones"; cap margin thin and wavy, (Breitenbach)
Pores: in parts flat on wood or horizontal parts 5-7 per mm, on sloping parts semi-irregular and up to 3 per mm, pore shape round to angular and thin-walled; "cream to pale straw-colored, becoming deeper in color and pale reddish brown to deep straw-colored with a shine when turned in incident light"; tube layer up to 0.3cm thick, colored as pore surface, semitranslucent and dense, (Gilbertson), 5-7 per mm, "rounded-angular, also sometimes elongated", cream; tube layer about 0.1cm thick, (Breitenbach)
Odor: weak (Breitenbach)
Taste: none, (Gilbertson), mild (Breitenbach)
Microscopic: spores 2.5-3.5 x 2-3 microns, elliptic, inamyloid, colorless, thin-walled; basidia 4-spored, 11-14 x 4-6 microns, with basal clamp; cystidia absent; hyphal system trimitic: generative hyphae 2-4 microns wide, clamped, often difficult to observe in dried specimens, skeletal hyphae predominant, 2-5 microns wide, agglutinated, straight, unbranched to occasionally branched, colorless, thick-walled, binding hyphae 2-3 microns wide, much branched, thick-walled, colorless, (Gilbertson), spores 2.5-3.5 x 2-2.5 microns, broadly elliptic, smooth, inamyloid, colorless, (Breitenbach)
Spore Deposit: white (Buczacki)
Habitat / Range
annual, usually on hardwoods such as Betula, Alnus, Populus and others, rarely on conifers like Abies, Picea, and Pinus, and on fruiting bodies of other polypores like Fomes, Fomitopsis, and Trichaptum; causes a white rot, (Gilbertson), usually in dense clusters, more rarely single, on dead hardwood, according to literature also rarely on conifers, (Breitenbach), summer, fall, winter, (Buczacki)
Similar Species
Antrodiella romellii grows flat on the substrate, occurs on conifers, and has larger spores, (Gilbertson). Postia floriformis has a bitter taste, slightly larger spores, and monomitic hyphal system, (Gilbertson). See also SIMILAR section of Antrodiella canadensis.
