The North American Species of Crepidotus

Ex 14. Phyllotopsis nidulans (Fr.) Sing., Rev. Myc. 1: 76. 1936.

Agaricus nidulans Fr., Syst. Myc. 1: 189. 1821.
Pleurotus nidulans (Fr.) Kummer, Der Führer in die Pilzk., p. 105. 1871.
Crepidotus nidulans (Fr.) Quél., Champ. Jura Vosges, Pt. III: 114. 1875.
Panus nidulans (Fr.) Pilát, Mykologie 7: 90. 1930.

Pileus 2-8 cm broad, sessile, orbicular and cupulate when young, becoming flabelliform, often imbricated, base color "zinc orange" to "ochraceous salmon," fibrillose or tomentose, the hairs white, dry, margin even, inrolled. Context thick, pliant, yellowish; odor and sometimes the taste strong, disagreeable.

Lamellae adnate to a lateral point of attachment, "zinc orange" to "ochraceous orange," close, narrow to medium broad, edges even.

Spores 5-7 x 2.3-3 µ, elongated, somewhat curved (cylindric-allantoid), smooth, in mass: "light congo pink," "vinaceous buff," or "light vinaceous cinnamon," fading when stored. Basidia 20-27 x 4.5 µ, 4-spored. Pleurocystidia and cheilocystidia none. Gill trama parallel to subparallel, hyphae 2.5-3.5 µ broad. Pileus trama interwoven. Cuticle of repent hyphae, bearing a turf of colorless hyphae, 2-4 µ broad. Clamp connections present.

Habit, Habitat, and Distribution: On conifer and deciduous stumps, logs, dead trunks, throughout the temperate zone, summer and autumn, also winter and spring in southern areas.

Material Studied: GEORGIA: J. F. Smith (TENN 16026); KENTUCKY: Bishop (TENN 10126); LOUISIANA: Hesler 22254; MICHIGAN: Smith 67234; TENNESSEE: Hesler 5229, 5230, 6540, 10121, 14055, 25806.

Observations: Although this species is shelving and of a Crepidotus habit, it has cylindric-allantoid, pink spores, and lacks cystidia. Singer has made it the type-species of the genus Phyllotopsis.