Fuscopostia fragilis
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Ecology: Saprobic on the deadwood of spruces and other conifers; causing a brown rot; growing alone or gregariously; annual; spring through fall, or over winter in warm climates; originally described from Sweden; widely distributed in Europe and in North America. The illustrated and described collections are from Illinois, Ohio, and Wisconsin.
Fruiting Body: Often producing a well-developed cap, but sometimes effused-reflexed, with only a few cap-like edges.
Cap (when present): 2.5-12 cm across; up to 2 cm deep; irregularly rectangular, or vaguely semicircular in outline; planoconvex to flat; dry or a little moist; fuzzy to appressed-hairy; whitish at first, but soon staining and discoloring reddish brown to brown.
Pore Surface: Whitish; bruising reddish brown to brown; with 4-5 angular pores per mm, especially near the margin—but the pores usually become lacerated and toothlike; tubes up to 15 mm deep.
Stem: Absent.
Flesh: White; unchanging when sliced; soft and pliable, becoming tougher with age.
Odor and Taste: Odor fragrant, or not distinctive; taste not distinctive.
Chemical Reactions: KOH negative on flesh; negative on cap surface; negative or slightly olive on pore surface.
Spore Print: White.
Microscopic Features: Spores 4-5 x 2-2.5 m (but occasionally as large as 7 x 3 m); allantoid to cylindric; smooth; hyaline in KOH; inamyloid. Basidia 15-18 x 4-5 m; clavate; 4-sterigmate. Cystidia not found. Setae not found. Hyphal system monomitic; hyphae 2-6 m wide, thin- or moderately thick-walled, smooth, hyaline to orange-brown in KOH, with conspicuous clamp connections.
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