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

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North American Species of Crepidotus

a turf of colorless hyphae, 2-5 It broad, at times the hyphal cells inflated
and then 6-9(14) It broad. Clamp connections present.
HABIT, HABITAT, AND DISTRIBUTION: On hardwood, Michigan, Colorado,
and Oregon,June-October; also Europe.
MATERIAL STUDIED: COLORADO: Smith 52903; MICHIGAN: Smith
57889, 66383; OREGON: Smith 19443; CZECHOSLOVAKIA: Pilat
149034 (type, PR, from Chrustenica, Bohemia, July 20, 1946), 189766,
189768 (PR).
OBSERVATIONS: The type is characterized by white pileus, white then
clay-color gills (no pink tints), spores 7-9(10) X 4.5-5.5(6) It, wrinkledverrucose, and rather long, slender, often slender-ventricose cheilocystidia.
We have encountered a form with pinkish gills, similar spores, and usually
shorter cheilocystidia. This we have described as var. roseifolius; and another
form with notably larger spores we have named var. megalosporus.
Favre (1960) says the spores in deposit are cinnamon brown-mars
brown of Ridgway, and that the spore wall is not echinulate but distinctly
verrucose, the warts low. Since he found the spores to measure 8-11(13)
X 5-6.5 lt, he assumes his collection may be a macrosporic form, and refers
to Pilat (1950: 164).
115. Crepidotus subverrucisporus var. roseifolius var. nov.
Illustrations: Figs. 30, 188.
Pileus 5-45 mm latus, ungulatus demum dimidiatus, primum albus deinde
obscurus, pubescens demum albo-fibrillosus. Lamellae albae deinde roseae denique cinnamomeae, angustae, subdistantes. Sporae 7-9(10) X 4.5-5.5(6) FI, ellipsoideae,
rugoso-verrucosae, "sayal brown." Basidia 27-33 X 6-8 pu, tetraspora. Pleurocystidia
desunt; cheilocystidia 25-45(60) X 3-8 It. Cuticula ex hyphis repentibus composita,
hyphas erectas sine colore gerens, 2-3(4-9) y latas. Fibulatae adsunt. Specimen
typicum in Herb. Univ. Mich.; lectum prope Pellston Hills, Mich., Oct. 7, 1955, A. H.
Smith 50875.
Pileus 5-45 mm broad, ungulate to dimidiate, white or whitish at first,
becoming somewhat dingy in age, pubescent to white cottony fibrillose,
margin at times crenate. Context thin, white; odor and taste not distinctive.
Lamellae white becoming pinkish, finally cinnamon, narrow, becoming
medium broad especially near point of attachment, subdistant, attached to
a pseudostipe, or merely arising from a basal point.
Stipe none, or only as a temporary pseudostipe.
Spores 7-9(10) X 4.5-5.5(6) It, ellipsoid to ovoid in face view, slightly
inequilateral in profile, wrinkled-verrucose, "sayal brown" in deposit.
Basidia 27-33 X 6-8 Ip, 4-spored. Pleurocystidia none; cheilocystidia
25-45(60) X 3-8 jt, filamentous, clavate, cylindric, or ventricose. Gill trama
subparallel to slightly interwoven, hyphae 4-7(10) It broad. Pileus trama
interwoven. Cuticle of repent hyphae, bearing a turf of colorless hyphae
2-3 AI, or some broader (up to 4-9 I). Clamp connections present.
HABIT, HABITAT, AND DISTRIBUTION: On hardwood sticks and branches,
Michigan, Colorado, Utah, and Oregon,June-November.