The North American Species of Crepidotus

Ex 7. Phaeomarasmius rufolateritius (Bres.) Sing., Lilloa 13: 85. 1947.

Crepidotus rufolateritius Bres., Hedgwigia 24: 186. 1885.

Pileus 2-4 mm broad, sessile, resupinate, rarely reflexed, cupulate, latericio-rufous, glabrous, margin lobed. Context membranous.

Lamellae radiating from an eccentric point, concolorous, distant, broad, edges white, rounded at the ends.

Spores 10.5-12.5 x (6.5) 7-9 µ, ellipsoid, smooth, with a germ-pore. Basidia 33-37 x 9-10 µ, 4-spored. Pleurocystidia none; cheilocystidia 38-48 x 6-8 µ, clavate, clustered, colorless. Epicuticular hyphae brown, septate, incrusted, with clamp connections.

Habit, Habitat, and Distribution: On bark of Crataegus, Missouri, March.

Material Studied: MISSOURI: Rabenhorst-Winter Pazxchke, Fungi No. 3941, part of the type (NY), collected by C. H. Demetrio, Emma, March, 1892. The type is in the Bresadola Herbarium Museum, at Stockholm.

Observations: The description of microscopic characters above is based on a study of the material from the New York Botanical Garden. It is sparse, and no sections of the pileus were made. Singer (1947) states that it is a native of southern United States.