The North American Species of Crepidotus

65. Crepidotus haustellaris (Fr.) Kummer, Der Führer in die Pilzk., p. 74. 1871.

Agaricus haustellaris Fr., Syst. Myc. 1, p. 274. 1821.

Illustrations: Figs. 133, 134.                                               

Pileus 4-10(15) mm broad, convex, becoming broadly so, marginate behind, dry, matted-fibrillose, "pinkish buff" to grayish-clay color, margin incurved. Context pale buff, pliant; odor none, taste slightly bitterish.

Lamellae bluntly adnate, pale buff becoming cinnamon brown, broad, subdistant, two tiers of lamellulae, edges crenulate or white-flocculose.

Stipe (1)3-8 mm long, 0.5-1.0 mm thick, eccentric to nearly lateral, appressed-fibrillose, concolorous with the pileus, pliant, solid, inserted.

Spores 7-9.5 x 5-6 (7) µ, ellipsoid to subovoid, inequilateral in profile, smooth, no germ-pore. Basidia 23-34 x 7-8 µ, 2-4-spored. Pleurocystidia 31-38 x 5-8 µ, scattered, cylindric or fusoid; cheilocystidia 36-61 x 4-12 µ, cylindric or slender-clavate, often capitate, at times slightly flexuous. Gill trama interwoven, hyphae 5-11 µ broad. Pileus trama loosely interwoven, hyphae 5-9 µ broad. Cuticle of repent hyphae, bearing tufts of brown, incrusted hyphae, 5-10 µ broad, and scattered, colorless, erect, relatively short hyphae. Clamp connections present.

Habit, Habitat, and Distribution: On hardwood logs, Michigan, July-August.

Material Studied: MICHIGAN: Lange 1001 (MICH); Smith 22261, 25518, 25748, 25998, 32230, 37137, 67018; CZECHOSLOVAKIA: Pilát 149016 (PR); GERMANY: Pilát 149015 (PR); ITALY: Pilát 149022 (PR).

Observations: The description above is based chiefly on Smith's No. 22261, which agrees well with other collections, including Pilát's from Europe. The incrustation of the brown hyphae on the pileus is at times obscure.

The colored pileus and its colored hyphae relate it closely to section Fulvidi.