The North American Species of Crepidotus

125. Crepidotus subcroceitinctus sp. nov.

Illustration: Fig. 204.

Pileus 15-30 mm latus, sessilis, flabelliformis demum semiorbicularis, flavus. Lamellae confertae, latae, flavido-pallidae. Sporae 5.5-7 (7.5) x 4.3-5 µ, ellipsoideae demum ovoideae, punctatae. Basidia 24-31 x 6-7 µ di- et tetraspora. Pleurocystidia desunt; cheilocystidia 24-38 x 6-18 µ. Cuticula ex 9-12 ordinibus hypharum composita, hyphas erectas sine colore et pileocystidia gerens, 27-43 x 4-9 µ vel 37-58 x 5-12 µ. Fibulae adsunt. Specimen typicum in Herb. Univ. Mich.; lectum in Warren Woods, prope New Buffalo, Mich., Sept. 4, 1955, A. H. Smith 51270.

Pileus 15-30 mm broad, sessile, flabelliform to semi-orbicular, lemon yellow, white-mycelioid behind. Context relatively thick, firm; taste mild.

Lamellae yellowish-pallid, close, broad.

Spores 5.5-7 (7.5) x 4.3-5 µ, ellipsoid to ovoid, slightly inequilateral, punctate. Basidia 24-31 x 6-7 µ, 2-4-spored. Pleurocystidia none; cheilocystidia 24-38 x 6-18 µ, fusoid, clavate, vesiculose or napiform, or ellipsoid with a short stipe. Gill trama interwoven, hyphae 4-7 (12) µ broad. Pileus trama loosely interwoven. Cuticle composed of 9-12 hyphae deep which extend radially, bearing, on the basal half, a turf of colorless hyphae 2-4 µ broad, and some pileocystidia 27-43 x 4-9 µ, and in front, only scattered erect hyphae and pileocystidia which are filamentous, clavate, ventricose, 37-58 x 5-12 µ. Clamp connections present.

Habit, Habitat, and Distribution: On hardwood, Michigan, September.

Material Studied: MICHIGAN: Smith 51270, type, from Warren Woods, New Buffalo, Sept. 4, 1955.

Observations: The spores of this species resemble somewhat those of C. croceitinctus, but the lemon yellow pileus and different structure of the cuticle distinguish the two.