Armillaria ostoyae
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Ecology: Parasitic and saprobic on the wood and roots of conifers and, less frequently, hardwoods (especially aspens and birches within conifer forests); causing a root rot; typically growing in dense clusters; summer and fall; originally described from France (Romagnesi 1970); widespread in Europe. The illustrated and described collection is from France.
Cap: 4-8 cm; convex at first, becoming broadly convex; dry or slightly moist; orangish brown to pinkish brown underneath small, brown to dark brown scales; the margin sometimes becoming finely lined.
Gills: Beginning to run down the stem; close; short-gills frequent; white or whitish when young and fresh, developing pinkish hues and/or reddish brown spots and discolorations.
Stem: 6-15 cm long; 0.5-1 cm thick; tapered to base; whitish to brownish, becoming darker brown or olive toward the base; finely hairy with brownish fibrils; with a well-developed whitish ring that may feature a brown edge; with yellowish mycelium near the base; attached to long black rhizomorphs that run through the wood.
Flesh: Whitish, becoming pinkish brown with maturity; unchanging when sliced.
Odor and Taste: Odor not distinctive; taste mild to slightly bitter.
Spore Print: White.
Microscopic Features: Spores 8-10 x 4-6 m; ellipsoid; smooth; hyaline in KOH; inamyloid. Basidia 33-35 x 6-8 m; clavate; often basally clamped; 4-spored. Cheilocystidia lageniform; thin-walled; hyaline in KOH. Pleurocystidia not found. Pileipellis a cutis; brownish in KOH; elements 5-10 m wide, smooth.
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