The North American Species of Crepidotus

Ex 8. Pyrrhoglossum pyrrhus (B. & C.) Sing., Mycologia 36: 367. 1944.

Agaricus pyrrhus Berk. & Curt.,Jour. Linn. Soc. 10: 291. 1868.
Crepidotus pyrrhus (B. & C.) Sacc., Syll. Fung. 5: 879. 1887.
Crepidotus laceratus Pat., Bull. Soc. Myc. France 18: 173. 1902.
Crepidotus substipitatus Murr., Mycologia 5: 31. 1913.

Pileus 1-3 cm broad, flabelliform, semiorbicular, to conchate, ochraceous to rufous, glabrous or subglabrous, margin even. Context thin, fragile.

Lamellae close or crowded, broad, ventricose, concolorous to pileus.

Stipe absent, or if present 4-8 mm x 1 mm, curved, eccentric, reddish-brown, glabrous.

Spores 4-5.5 x 3-4.5 µ, ellipsoid or ovoid, conspicuously warty, no germ-pore, dark rusty-brown in 2% KOH. Basidia 14-18 x 5-6 µ, 4-spored. Pleurocystidia none; cheilocystidia 25-42 x 4-8 µ, cylindric and often capitate, or flask-shaped with a neck. Gill trama undulating-subparallel, hyphae 2-5 µ broad. Pileus trama interwoven. Cuticle of repent hyphae, bearing occasional, erect, colorless hyphae. Clamp connections present.

Habit, Habitat, and Distribution: On dead wood, Cuba and Guadeloupe.

Material Studied: CUBA: Berkeley and Curtis 38, type (K) of Agaricus pyrrhus, collected by C. Wright; Murrill 1236, type (NY) of Crepidotus substipitatus, collected by Underwood & Earle, Baracoa, March, 1903; GUADELOUPE: Patouillard, type (FH) of Crepidotus laceratus, 1886.

Observations: The warty spores place this species in the genus Pyrrhoglossum, as proposed by Singer (1944). The description of microscopic characters is based on a study of the type of P. pyrrhus. Pilát (1950) reports the spores of the type of P. pyrrhus to be larger (8-8.5 x 5.6-5.8 µ) than we observed.