Major Groups > Polypores > Stemmed, Pale-Fleshed > Polyporus brumalis

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Polyporus brumalis

[ Basidiomycota > Polyporales > Polyporaceae > Polyporus . . . ]

by Michael Kuo

This small, dark brown polypore distinguishes itself from similar species by having a stem which does not become black, a smooth (rather than hairy) cap margin, and tiny circular pores. It fruits on the deadwood of hardwoods, and has a special affinity for birch. The tough fruiting bodies are persistent and can be found year-round, but it tends to come up fresh in fall and spring. Polyporus arcularius is very similar, but features a cap margin that is fringed with tiny hairs, and a paler cap surface.

Description:

Ecology: Saprobic on decaying wood of hardwoods and especially frequent on dead birch wood; growing alone or gregariously; fall and spring, but found nearly year-round; widely distributed in North America. The illustrated and described collections are from Québec, Illinois, and Michigan.

Cap: 2–8 cm; broadly convex with a tucked-under margin at first; becoming flat, or shallowly depressed; round in outline; dry; bald or very finely hairy; dark yellowish brown to dark brown.

Pore Surface: Running slightly down the stem; white; not bruising; with 2–3 round pores per mm; tubes to 3 mm deep.

Stem: Central or somewhat off-center; 2–4 cm long; 2–5 mm wide; equal; dry; bald or finely hairy; whitish to grayish or pale brownish; tough.

Flesh: Whitish; thin; very tough.

Spore Print: White.

Microscopic Features: Spores 6–7 x 1–1.5 µm; cylindric; smooth; hyaline in KOH. Hymenial cystidia not found. Hyphal system dimitic. Clamp connections present.


REFERENCES: (Persoon, 1794) Fries, 1818. (Fries, 1821; Saccardo, 1888; Overholts, 1953; Smith, Smith & Weber, 1981; Gilbertson & Ryvarden, 1986; Phillips, 1991/2005; Kruger, 2002; Lincoff, 1992; Nunez & Ryvarden, 1995; Barron, 1999; Roody, 2003; McNeil, 2006; Binion et al., 2008; Sotome et al., 2008.) Herb. F 1116132, 1116133, 1188572.


Thanks to the Field Museum of Natural History for lending specimens for study.


This site contains no information about the edibility or toxicity of mushrooms.


 

Polyporus brumalis

Polyporus brumalis

Polyporus brumalis



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Kuo, M. (2015, May). Polyporus brumalis. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/polyporus_brumalis.html