The North American Species of Crepidotus

Ex 2. Simocybe tiliophila (Pk.) Sing., Agar., 2nd ed., p. 588. 1962.

Agaricus (Crepidotus) tiliophilus Pk., N. Y. State Mus. Ann. Rept. 35:133. 1884.
Crepidotus tiliophilus (Pk.) Pk., N. Y. State Mus. Ann. Rept. 39: 70. 1886.
Naucoria tiliophila (Pk.) Sing., Mycologia 35: 163. 1943.

Pileus 1-2.5 cm broad, convex, hygrophanous, watery-brown and striatulate when moist, dingy-buff when dry, minutely pulverulent. Context moderately thin.

Lamellae adnexed, rounded behind, concolorous, becoming ferruginous-cinnamon, rather broad, subdistant. Stipe 4-8 mm x 2 mm, pruinose, white-pubescent at the base, often curved, solid.

Spores 5.5-7 x 4-4.5 µ, ellipsoid to subovoid, smooth, pale fuscous under microscope. Basidia 17-21 x 5-6 µ, 4-spored. Pleurocystidia none; cheilocystidia 18-29 x 4-8 µ, clustered, clavate, colorless. Gill trama subparallel. Pileus trama interwoven. Cuticle not sharply differentiated; the surface hyphae give rise to erect, brownish, clavate cystitioid cells, scarcely in a palisade or a trichodermium. Clamp connections none.

Habit, Habitat, and Distribution: On dead trunks and branches of Tilia americana, New York, August.

Material Studied: NEW YORK: Peck, the type, collected by Peck, East Berne, August.

Observations: The description of microscopic characters above is based on a study of the type. Singer (1962), in describing the genus Simocybe, says that the hyphae are usually with clamp connections; in S. tiliophila, however, clamps are absent. Smooth spores and the presence of pileocystidia characterize the genus Simocybe.