The North American Species of Crepidotus

10. Crepidotus uber var. cystidiosus var. nov.

Illustrations: Figs. 43, 44.

Pileus 8-15 mm latus, reniformis, albidus, siccatus ochraceus, glabrosus, margine planus. Lamellae angustae vel medio-latae, confertae vel medio-confertae, albae deinde ochraceo-brunneae. Sporae 6-8 x 4-5 µ, ellipsoideae, planae. Pleurocystidia 26-35 x 6-8 µ; cheilocystidia hymenialia: 33-50 x 4-10 µ tramalia: 57-75 x 7-8 µ. Pilei trama et cuticula aequaliter gelatinosae. Pileocystidia aliquantulum clavata, 22-50 x 3-7 µ. Fibulae desunt. Specimen typicum in Herb. Univ. Tenn.; lectum prope La Follette, Tenn., July 11, 1934. L. R. Hesler 4101.

Pileus 8-15 mm broad, sessile, fan-shaped, reniform, whitish, drying ochraceous, glabrous, margin even. Context with a soft or slightly rubbery texture.

Lamellae narrow or medium broad, close or moderately so, white, finally ochraceous-brown.

Spores 6-8 x 4-5 µ, ellipsoid, slightly or not at all inequilateral in profile, smooth. Basidia 22-28 x 6-7 µ, 2-4-spored. Pleurocystidia 26-35 x 6-8 µ, clavate or flask-shaped, appendiculate; cheilocystidia of two types: (1) hymenial, 33-50 x 4-10 µ, cylindric-ventricose, fusoid, flask-shaped, often with a neck, at times with a brownish pigment; (2) tramal, gelatinous, 57-75 x 7-8 µ, filamentous with a clavate apex, at times appendiculate. Gill trama subparallel, hyphae branched, 4-10 µ broad. Pileus trama loosely interwoven, the hyphae branched, somewhat gelatinous, the gelatinization homogeneous throughout the pileus trama and cuticle, or the cuticle only slightly more gelatinized and then showing an indistinct band at the surface. Cuticle not differentiated, the surface bearing scattered to numerous erect, colorless hyphae, and pileocystidia which are more or less clavate, 22-50 x 3-7 µ. Clamp connections none.

Habit, Habitat, and Distribution: On hardwood log, Tennessee, July.

Material Studied: TENNESSEE: Hesler 4101, type, from LaFollette, July 11, 1934; 10783.

Observations: This variety differs from C. uber var. uber in having pleurocystidia; and from C. alabamensis in its peculiar gelatinization of the pileus and cuticle.