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

Smith * Hesler

109

the mount stands. Clamp connections present. Some amyloid debris
present in places in a mount but all hyphae inamyloid.
HABIT, HABITAT, AND DISTRIBUTION: Caespitose on rotton wood, Idaho,
June, Smith 65001 type, 58682, 65043, 65131, 65154, all from near
McCall, Idaho.
OBSERVATIONS: In Smith 65131 the hymenophoral trama when fresh
became pale rusty brown to dark ochraceous in KOH. The type, however,
was not tested when fresh. Also, the gills appeared close when fresh but
as dried there is no appreciable difference in gill spacing between it and
other collections. We hesitate to emphasize the presence of pleurocystidia
between the gills as an important taxonomic character. P. obscura is
distinct from P. vernalis by its broad gills which are typically subdistant,
P. galerinoides has abundant pleurocystidia, incrusted hyphae in the
pileus (hypodermial zone) and small cheilocystidia.
47. Pholiota tahquamenonensis sp. nov.
Illustrations: Text figs. 144-145.
Pileus 2.0-2.5 cm latus, planus, margine laceratus, "buckthorn
brown," deinde "pale pinkish buff," disco "warm buff," glabrosus, viscidus.
Caro fragilis; odore et gustu mitis. Lamellae adnatac, paene "buckthorn
brown," latae, confertae demum subdistantes, demum ventricosae. Stipes
2 cm longus, 3 mm crassus, supra pallidus, infra obscure flavido-brunneus,
ad imum albae rhizomorphae. Velum fasciens tenuem, medianum,membraneaceum annulum. Sporae 6-8 x 3.8-4.5(5) ap, ellipsoideae demum
subovoides, leves, truncatae. Pleurocystidia 36-47 x 2-3 X 3-4 pt, ampullacea, cervice longa, apicibus acuta vel subcapitata; cheilocystidia similia.
Cuticula gelatinosa. Specimen typicum in Herb. Univ. Mich. conservatum
est; lectum in Tahquamenon Falls State Park, Michigan, 6 July, 1959,
Smith 60944.
Pileus 2-2.5 cm broad, plane with a lacerate margin in age, glabrous,
moist, viscid when young, "buckthorn brown" (yellow-brown) fading to
pale pinkish buff, rather strongly hygrophanous, disc finally pale yellow
("warm buff"). Context fragile, odor and taste mild.
Lamellae adnate, seceding, broad, close to subdistant, dull yellowbrown (near "buckthorn-brown"), ventricose in age, edges slightly
fimbriate.
Stipe 2 cm long, about 3 mm thick, equal, pallid above, dull yellowbrown below, with white rhizomorphs at the base, with a thin median
membranous annulus.
Spores 6-8 x 4-5 pi, smooth, in face view mostly ovate but varying
to elliptic, in profile obscurely inequilateral to ovate, wall thickened to
about 0.25,/, apex obscurely to distinctly truncate from an apical pore,
apiculus minute but present as seen in a profile optical-section; tawny to