The North American Species of Crepidotus

Ex 4. Melanotus psychotriae (Pat.) Sing., Lloydia 9: 130. 1946.

Crepidotus psychotriae Pat., Bull. Soc. Myc. Fr. 18: 173. 1902.

Pileus 5-10 mm broad, sessile, convex, orbicular, indented or marginate behind, scattered or caespitose, pale-ochraceous, glabrous, smooth, margin entire. Context fleshy, firm.

Lamellae crowded or close, broad, brownish, inserted, edges serrate.

Spores 6.7-8 x 4.5-5.5 µ, ellipsoid to ovoid, smooth, often lentiform-compressed, with a germ-pore, brownish, tinged purplish. Basidia 12-16 x 3-5 µ. Pleurocystidia none; cheilocystidia 12-23 x 2-6 µ, flask-shaped, ventricose, or cylindric, small and inconspicuous. Gill trama interwoven, hyphae 2-4 µ, broad. Pileus trama loosely interwoven. Cuticle a narrow gelatinous zone, 12-43 µ thick. Clamp connections on the hyphae of the pileus trama and the cuticle.

Habit, Habitat, and Distribution: On dying branches of Psychotria glabrata, Guadeloupe and Martinique.

Material Studied: GUADELOUPE: Patouillard, Nos. 33 and 403, type (FH).

Observations: The shape and color of the spores caused Singer (1946) to transfer it from Crepidotus to Melanotus. The cheilocystidia, in the type, are relatively small and inconspicuous.