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

Smith ~ Hesler

357

194. Pholiota bigelowii sp. nov.
Pileus 3-4.5 cm lat us, late convexius, sordide brunneus, in siccati
latera-riis; vellum sulp/limreTim; lamellae sulphureae; stipes sursum sulphaireiis, (eor-slim sordide briimnnels; spore 6-7.5 x 3.8-4.5 i.; ple(lrocystidia f.soide venltricosa vel slibc1avata, tenuiniinicata; specimen typicr m
in Herb. Un7iv. Mich. conservatutm est; legit prope Mackinaw City, Mich.
Aug. 27, 1953 (Smith 42423).
Pileus 3-4.5 cm broad, broadly convex with an incurved margin,
expanding to plane or nearly so, color dull dark yellowish brown on
disc ("Saccardo's umber") slightly paler to the sulphur yellow margin,
in drying becoming evenly brick red, with flecks of veil tissue over marginal area at first, glabrous in age, slimy-viscid; veil yellow. Context thin
and pliant yellowish, odor and taste not recorded.
Lamlellae crowded, short-decurrent, narrow (caps all young) sulphur
yellow, edges even.
Stipe 2-4 cm long, 3-6 mm thick, equal, hollow, collapsing in drying, surftace sulphur yellow above, dingy yellow-brown below, veil leaving
onlxy an evanescent sulphur colored fibrillose zone.
Spores 6-7.5 X 3.8-4.5 /u, smooth with a minute apical pore, shape
in face view ovate to sutbelliptic, in profile bean-shaped to obscurely
inequilateral; color in KOH pale ochraceous to brownish ochraceous, in
Melzer's aboutt tlle same; wall about 0.25,u or less thick.
Basilia 4-spored, 20-25 x 5-6.5 /L, pale sullphur in KOH from
content. Pletirocystidia abundant, 46-68 x 11-16 p. fusoid-ventricose varying to clavate or elliptic-pedicellate, but projecting prominently, smooth,
thin-walled, neck witli yellow colloidal content in KOH, about tlie same
color in Melzer's. Cheilocystidia similar to pletlrocystidlia but more sul)clavate to broatlly ventricose with short neck and obtuse apex. Caulocystidia elongate-clavate, (36) 10-90 x 6-11 J or near stipe-apex fusoidventricose and up to 90 X 14 /L, yellowish hlyaline in KOH or witl
ochraceous coagulated content.
Gill trama a central strand of greenisll ochraceous (in KOH)
smooth, thin-walled hyphae in parallel arrangement; subhymeniulm of
diverging narrow hyphae in a slime matrix. Pileus pellicle thick, of interwoven narrow gelatinous hyphae with disentegrating walls, yellow to
hyaline in KOH, walls roughened as one approaches tlle hypodermium,
reddish fulvous, of compactly arranged narrow (3-10 a) non-gelatinous
hyphae. Context hyphae, greenish yellow in KOH, thlin-walled, smooth,
cells inflated to 15 pu +. Clamp connections present.
HABIT, HABITAT, AND DISTRIBUTION: Gregarious on an old hardwood
log, Mackinaw City, Hardwoods, Emmet County, Mich., Aug. 27, 1953.
H. E. Bigelow, Smith 42423, type.
OBSERVATIONS: The species was thought to be an unusually bright
colored collection of Pholiota spumosa when it was collected but the