The North American Species of Crepidotus

39. Crepidotus malachius var. trichiferus var. nov.

Illustrations: Figs. 93, 94.

Pileus 1-5 cm latus, sessilis, dimidiatus, spatulatus, demum flabelliformis, pallidus vel cineraceus, obscuro-brunnaceus demum avellaneus maturus, minimum pubescens. Lamellae pallidae deinde "clay color" vel obscuro-cinnamomeae, latae vel medio-latae, confertae. Sporae 5-7 µ, globosae demum subovoideae, punctatae. Basidia 22-27 x 6-7 µ, di- et tetraspora. Pleurocystidia desunt; cheilocystidia 39-90 x 5-8 µ. Cuticula ex hyphis repentibus composita, pileocystidia cheilocystidiis similia gerens. Fibulatae adsunt. Specimen typicum in Herb. Univ. Mich.; lectum in Mt. Rainier National Park, Wash., Oct. 17, 1952, A. H. Smith 41123.

Pileus 1-5 cm broad, sessile, dimidiate, spathulate to flabelliform, hygrophanous, pallid to grayish, becoming dull brownish to avellaneous or dull cinnamon as spores mature, more or less minutely pubescent. Context thin; odor and taste mild.

Lamellae broad or medium broad, close, pallid, becoming clay color or dull cinnamon at maturity, edges even or eroded.

Spores 5-7 µ, globose to subovoid, punctate or subechinulate. Basidia 22-27 x 6-7 µ, 2-4-spored. Pleurocystidia none; cheilocystidia 39-50 (90) x 5-8 µ, cylindric, some subcapitate, usually more or less constricted, flexuous. Gill trama subparallel, hyphae 5-11 µ broad. Pileus trama interwoven. Cuticle of repent hyphae, bearing scattered to numerous, erect pileocystidia similar to cheilocystidia. Clamp connections present.

Habit, Habitat, and Distribution: On hardwood and conifer (pine and hemlock) logs, Michigan, Idaho, Washington, Oregon, Tennessee, Mexico, and Netherlands, March and June-October.

Material Studied: IDAHO: Smith 54010, 54513, 54544, 54732, 54737, 54911, 54990, 54225, 66279; MICHIGAN: Potter 3406 (MICH); Smith 1250, 9552, 32891, 57864, 60975, 63536, 63669, 66270; Thiers 3509, 3544 (MICH); NEW YORK: Clark (CUP 5522); OREGON: Smith 20244, 26753; TENNESSEE: Hesler 5009,16336; WASHINGTON: Smith 41123 (type, from Mt. Rainier Nat'l. Park, Oct. 17, 1952); MEXICO (Veracruz): Sharp (TENN 17552); NETHERLANDS: Bas, Sept. 20, 1962 (TENN 26096).

Observations: The prominent pileocystidia and the cheilocystidia characterize this variety.