North American species of Crepidotus, by L.R. Hesler and Alexander H. Smith.

Hesler ~ Smith

141

equilateral in profile, verruculose-asperulate, dark brown, wall thick.
Pleurocystidia and cheilocystidia not observed. Gill trama undulatingparallel, hyphae 3-6 I, broad. Pileus trama interwoven. Cuticle repent,
apparently of several (5-6) hyphal layers. Clamp connections not found.
Singer (1962) says clamps present on all hyphae in the genus Pyrrhoglossum.
HABIT, HABITAT, AND DISTRIBUTION: It is reported from California by
McClatchie (see Murrill, 1917: 158).
MATERIAL STUDIED: CEYLON: type, No. 52, from Kew Herbarium.
OBSERVATIONS: The tissues of the type are collapsed and do not revive well. Pilat (1950) suggested that this species does not belong to Crepidotus, but is related to Pholiota-Rozites. Singer (1962) places it in the genus
Pyrrhoglossum, as P. hepatizon (Berk.) Sing.
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,/, ellipsoid to subovoid, smooth, pale fuscous
under microscope. Basidia 17-21 X 5-6 j, 4-spored. Pleurocystidia none;
cheilocystidia 18-29 X 4-8 j/, 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 pilocystidia characterize the genus Simocybe.
Ex 3. Melanotus eccentricus (Murr.) Sing. Lilloa 13: 87. 1947.
Crepidotus eccentricus Murr., North Amer. Flora 10: 155. 1917.
Pileus 5 mm broad, convex, not umbonate, subcircular, isabelline,
glabrous, margin entire, incurved.