The North American Species of Crepidotus

Ex 1. Pyrrhoglossum hepatizon (Berk.) Singer, Sydowia 5: 474. 1951.

Agaricus (Crepidotus) hepatizon Berk., apud Hooker, London Jour. Bot. 6: 486. 1847.

Crepidotus hepatizon (Berk.) Sacc., Syll. Fung. 5: 879. 1887.

Pileus 1.5-2.5 cm broad, usually eccentric, moderately convex to subplano-umbilicate, fuscous, lobed-sinuous. Lamellae brown (ferruginous), moderately close, narrow.

Stipe conspicuous, 1.5-2.5 cm long, 5 mm broad, cylindric central or eccentric, not rarely sublateral.

Spores 4.6-5.5 x 2.8-4 µ, ovoid, or more or less ellipsoid, slightly inequilateral in profile, verruculose-asperulate, dark brown, wall thick. Pleurocystidia and cheilocystidia not observed. Gill trama undulating-parallel, hyphae 3-6 µ 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. Pilát (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.