Pluteus atromarginatus

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Ecology: Saprobic on decaying conifer wood; growing alone or scattered; summer and fall; widely distributed in North America. The illustrated and described collection is from Arkansas.

Cap: 4-7 cm across; convex at first, becoming broadly convex or nearly flat--but often featuring a broad central bump; dark blackish brown to nearly black; with pressed-down, streaked fibers and often, over the center, small and inconspicuous scales.

Gills: Free from the stem; close; whitish at first, becoming pink; short-gills frequent; with dark brown or nearly black edges from the margin to the stem.

Stem: 4-7 cm long; up to 1 cm thick; with a slightly swollen base; dark brown; longitudinally fibrillose.

Flesh: Whitish; unchanging when sliced.

Odor and Taste: Not distinctive.

Spore Print: Pink.

Microscopic Features: Spores 6-7.5 x 4-5 ; broadly ellipsoid; smooth; hyaline and uni- to multiguttulate in KOH; inamyloid. Cheilocystidia cylindric to clavate or subcapitate; to 50 x 10 ; thin-walled; with brown contents. Pleurocystidia thick-walled; at first merely widely lageniform, but soon developing 2-4 apical hooks; 50-100 x 10-25 ; hyaline in KOH. Pileipellis a cutis. Clamp connections present.

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