The North American Species of Crepidotus
29. Crepidotus applanatus var. phragmocystidiosus var. nov.
Illustrations: Figs. 80, 81.
Pileus 8-14 mm latus, sessilis, semi-orbicularis demum flabelliformis, albidus deinde "cinnamon buff," subglabrosus. Lamellae albae deinde "Sayal brown," angustae, confertae. Sporae 4-5 (5.5) µ, globosae, punctatae. Basidia 21-25 x 4-6 µ, di- et tetraspora. Pleurocystidia desunt; cheilocystidia 30-65 x 6-14 µ, septata. Cuticula ex hyphis repentibus composita, pileocystidia gerens, 20-60 (120) x 4-6 µ. Fibulae adsunt. Specimen typicum in Herb. Univ. Mich., lectum in Manitou Island, Mich., Aug. 3, 1957, A. H. Smith 57473.
Pileus 8-14 mm broad, semiorbicular to flabelliform, hygrophanous, whitish when dry, cinnamon buff when wet, glabrous or nearly so, tomentose at base.
Lamellae white, finally "Sayal brown," crowded or close, narrow to moderately so.
Spores 4-5 (5.5) µ in diameter, globose, punctate. Basidia 21-25 x 4 -6 µ, 2-4-spored. Pleurocystidia none; cheilocystidia 30-65 x 6-14 µ, clavate, ventricose, flask-shaped, bottle-shaped, subcylindric, at times capitate, more rarely slightly forked, frequently 1-3-septate. Gill trama subparallel, hyphae 5-15 µ broad. Pileus trama interwoven. Cuticle of repent hyphae, bearing scattered to numerous (and then more or less a turf), erect pileocystidia , cylindric to subventricose, 20-60 (120) x 4-6 µ. Clamp connections present.
Habit, Habitat, and Distribution: On hardwood, Michigan, August.
Material Studied: MICHIGAN: Smith 57472, 57473 (type, from Manitou Island, August 3, 1957).
Observations: In some pilei the gills are quite narrow, as in the typical applanatus; in others they are only moderately narrow. The septate cheilocystidia distinguish it from other varieties.