The North American Species of Crepidotus

71. Crepidotus kauffmanii sp. nov.

Crepidotus calolepis (Fr.) Karst. sensu Kauffman, Agar. Mich. 1: 522. 1918.

Illustrations: Figs. 20, 144.

Pileus (6) 10-30 mm latus, sessilis, convexus,flabelliformis, "light buff," "fawn" vel "tawny olive”,"fibrillis vel squamis "avellaneous" demum "light vinaceous cinnamon" densis. Lamellae confertae vel densae, latae, primum albae deinde "pale cinnamon buff" vel "avellaneous." Sporae (5) 5.5-7 (8) x 4-5 (5.5) µ, ellipsoideae vel subovoideae, punctatae. Basidia (20) 25-33 x 6-7 (8) µ, di- et tetraspora. Pleurocystidia desunt; cheilocystidia 30-50 (80) x 5-11 µ. Cuticula ex hyphis repentibus composita, hyphas brunneas incrustatas et non-incrustatas sine colore gerens. Fibulae adsunt. Specimen typicum in Herb. Univ. Mich.; lectum prope Pellston, Mich.; Sept. 21, 1957, A. H. Smith 57814.

Pileus (6) 10-30 mm broad, sessile, convex, flabelliform, dry, light buff, fawn, or "tawny olive," with dense, "avellaneous," or "wood brown" to "light vinaceous cinnamon" fibrils which may fade to pallid in age, fibrils appressed or felted, at times aggregated to form scales, basal portion white to buff tomentose. Context thin, light-drab to whitish; odor and taste not distinctive.

Lamellae rounded behind, broad, close or crowded, with 4-5 tiers of lamellulae, white at first, then pale cinnamon buff or avellaneous.

Spores "Sayal brown" in deposits, (5) 5.5-7 (8) x 4-5 (5.5) µ, ellipsoid or subovoid, obscurely inequilateral in profile, punctate. Basidia (20) 25 -33 x 6-7 (8) µ, 2-4-spored. Pleurocystidia none; cheilocystidia 30-50 (80) x 5-11 µ, clavate or ventricose, at times cylindric or filamentous, the apices rounded or more rarely forked. Gill trama interwoven to subparallel, hyphae 5-8 (12) µ broad. Pileus trama interwoven. Cuticle of repent hyphae, bearing a tangled turf of brown, incrusted hyphae, 5-9 µ broad, and colorless hyphae, 3-5 µ broad. Clamp connections present.

Habit, Habitat, and Distribution: On hardwood logs and fallen limbs, Canada, Michigan, Tennessee, and New Mexico, June-October.

Material Studied: MICHIGAN: Potter 3671 (MICH); Shaffer 2593 (MICH); Smith 9550, 21704, 25508, 25814, 32303, 32304, 33866, 36668, 42029, 49595, 49766, 50893, 50941, 57089, 57814 (type, on aspen log, Pellston, Sept. 21, 1957), 57821, 57862, 57863, 58061, 63512, 63584, 66259, 66848, 66867, 66910; Thiers 2897; NEW MEXICO: Barrows 1290 (MICH); TENNESSEE: Hesler 26080; CANADA (Ontario): Smith 26534; (Quebec): Smith 26601.

Observations: From the evidence at hand, specimens and literature, the European C. calolepis has smooth spores 7-10 x 5-6 µ, a gelatinous cuticle, and no clamp connections. It is therefore closely related to C. mollis; and Pilát (1948) and Kühner & Romagnesi (1953) treat it as a variety of C. mollis. On the other hand, Kauffman's C. calolepis has punctate spores, 5.5-7 x 4-5 µ, a non-gelatinous cuticle, and clamp connections. From our study of Kauffman's and other collections, it is apparent that, until now, this is an undescribed species.