The North American species of Psathyrella.

140

MEMOIRS OF THE NEW YORK BOTANICAL GARDEN

[VOL. 24

mature violaceous fuscous (lacking a cinnamon or vinaceous-brown tone), edges
even.
Stipe 4-6 cm long, 2-3.5 mm at apex, equal or nearly so, fragile, white over
all, pruinose at very apex, soon naked lower down; veil thin and fibrillose.
Spore deposit fuscous-black; spores 8-10 x 4.5-5.5 x 5.5-7 u, smooth, apical
pore prominent and apex in some obscurely snoutlike, compressed, in face view
prominently ovate to obscurely angular-ovate, in profile subelliptic to obscurely
inequilateral, color in KOH dark chocolate-color, in Melzer's dark reddish tawny,
wall about 0.6,u thick.
Basidia 4-spored, 20-25 x 6-8 g, hyaline in KOH. Pleurocystidia 38-56 (-63)
x9-14(-16) a, utriform, varying to elongate fusoid-ventricose with obtuse to
rounded apex, smooth, thin-walled, hyaline in KOH, content not distinctive.
Cheilocystidia vesiculose to clavate-saccate, 22-36x10-15 gu, or obtusely fusoid
to fusoid-ventricose or similar to pleurocystidia. Caulocystidia gigantic (up to
150 x 20 x 15 A), utriform to clavate, thin-walled, hyaline in KOH.
Pileus cuticle a layer of vesiculose cells 2-3 deep, some clavate-pedicellate cells
also present, walls thin, smooth and hyaline, content of cells not distinctive.
Hyphae of pileus trama vinaceous-cinnamon in KOH, hyphal walls incrusted
(crush out sections to see single hyphae). In mounts revived in Melzer's no
distinctive reaction seen on any tissue. Clamps present.
Type locality. Priest Lake, Idaho.
Habit and habitat. Scattered on humus under cottonwood, October.
Distribution. Idaho, Oregon.
Observations. This variant is distinguished chiefly on the more copious veil
which is heavy enough to leave appendiculate patches on the margin when it
breaks.
Material examined. Idaho: Smith 73947 (Type). Oregon: Sipe 1100.
94. Psathyrella albanyensis A. H. Smith, sp. nov.
Pileus 1-3 cm latus, conicus demum campanulatus vel convexus, glaber sed
ad marginem appendiculatus; cinnamomeo-brunneus; lamellae latae, confertae,
sordide vinaceo-brunneae; stipes 4-8 cm longus, 2-3.5 mm crassus; deorsum
demum brunneolus; sporae 7-9 x 4-5 x 5-6 g; pleurocystidia 35-48 x 10-18 u,
fusoide ventricosa, ad apicerum late rotundata vel obtusata; fibulae adsunt.
Typus. Solheim 4438 (MICH); legit prope Laramie, Albany County, Wyoming.
Pileus 1-3 cm broad, obtusely conic expanding to campanulate or broadly
convex, surface glabrous except on or near the margin where it is appendiculate
with submembranous patches of the pallid veil, dark reddish rusty brown fading
to tan and drying to a dingy reddish tawny, margin curved in at first. Context
thin and fragile.
Lamellae close, broad, adnate, "bone brown" to darker as dried.
Stipe 4-8 cm long, 2-3.5 mm thick, equal, fragile, hollow, surface whitish
becoming tan beneath the evanescent veil fibrils, and dingy brown as dried, lacking a pseudorhiza.
Spores 7-9 x 4-5 x 5-6 /, smooth, apical pore indistinct and apex not truncate;
shape in face view ovate to broadly elliptic or at base distinctly angular and
apiculate, or angular-ovate, many corn-kernel-shaped, in profile somewhat inequilateral to ovate, color rich cocoa-brown in KOH and darkening to chocolatebrown, in Melzer's rich tawny, wall about 0.3 /A thick.
Basidia 4-spored, clavate, hyaline. Pleurocystidia 35-48 x 10-18,, broadly