Summary:
Crepidotus subverrucisporus is characterized by a white cap, white gills that become clay color or pinkish, an absent or short lateral stem, spore size and shape, and rather long slender or slender-ventricose cheilocystidia. Var. subverrucisporus is described here (derived from Hesler(3)). A variety with gills that become pinkish, similar spores, and usually shorter cheilocystidia is described by Hesler(3) as var. roseifolius. Var. megalosporus from Colorado has gills that become pinkish but larger spores measuring 8-13 x 5-7 microns.
Hesler(3) examined var. subverrucisporus collections from OR, CO, MI, and Czechoslovakia, var. roseifolius from OR, CO, MI, and UT, and var. megalosporus from CO. The specimens Hesler(3) examined as C. epibryus (Fr.) Quelet sensu Pilat from CO, MI, and TN are now considered C. subverrucisporus according to Bandala(5). Oluna Ceska reports this species from BC (pers. comm.)
Cap:
0.4-2(3)cm broad, conchate [shaped like oyster-shell], then fan-shaped to kidney-shaped or suborbicular [somewhat circular], margin incurved; white; dry, pubescent [downy]
Gills:
close to nearly subdistant, broad to medium broad; white becoming clay color; edges white and crenulate [finely scalloped], (Hesler(3) for var. subverrucisporus), attached to a pseudostem or arising from a basal point, subdistant, narrow becoming medium broad, white becoming pinkish, finally cinnamon, (Hesler(3) for var. roseifolius)
Stem:
none or short-lived lateral pseudostem
Microscopic spores:
spores 7-9(10) x 4.5-5.5(6) microns, elliptic, inequilateral in side view, wrinkled-verrucose, [no germ pore]; basidia 2-4 spored, 24-33 x 6-8 microns; pleurocystidia none, cheilocystidia 37-70 x 5-8 microns, "cylindric, slender bottle-shaped with a neck, or ventricose"; cap cuticle of repent hyphae, bearing a turf of colorless hyphae 2-5 microns wide, at times the hyphal cells inflated and then 6-9(14) microns wide; clamp connections present, (Hesler(3) for var. subverrucisporus), spores 7-9(10) x 4.5-5.5(6) microns; basidia 27-33 x 6-8 microns; cheilocystidia 25-45(60) x 3-8 microns, "filamentous, clavate, cylindric, or ventricose", (Hesler(3) for var. roseifolius)
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