The North American species of Psathyrella.

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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN

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demum fulvae dein fuscae; stipes 2-5 cm longus, deorsum brunneus, sparse
fibrillosus, sursum pruinosus; sporae 7-9 x 4.5-5 I; pleurocystidia 50-75 x 9-14 t,
anguste fusoideo-ventricosa, rotundata vel obtusa; fibulae adsunt. Typus. Smith
55689 (MICH); legit prope McLeod, Oregon.
Pileus 8-20 (-25) mm broad, obtusely conic with a straight margin, becoming
campanulate to broadly convex, at first with scattered veil fibrils near the margin
but soon glabrous, moist and hygrophanous, cinnamon-brown to dull tawny fading
to pale tan but darker when dried. Context thin, concolorous with surface either
moist or faded, odor none.
Lamellae close to subdistant, broad, adnate, seceding, brownish when young,
rusty brown near maturity and dark wood brown (grayer) finally, but drying
cocoa-color; edges even, not becoming pinkish.
Stipe 2-5 cm long, 1-2 mm thick, equal, fragile, tubular, surface brown below
and sparsely fibrillose, paler above and pruinose, brown over all in age, base with
pallid mycelium.
Spores 7-9x4.5-5 /, apical pore distinct, smooth, fulvous in KOH, elliptic
to ovate in face view, in profile obscurely to somewhat inequilateral, wall -0.3 p
thick.
Basidia 4-spored. Pleurocystidia 50-75 x 9-14 g, narrowly fusoid-ventricose,
the narrow pedicel often longer than the neck, apex obtuse to rounded and frequently with a globule 1-2 u/ in diam. in the apex (or a small bit of coagulated
highly refractive material adhering to the wall somewhere near the apex), cystidial
wall thin and hyaline. Cheilocystidia similar to the pleurocystidia but shorter,
some clavate-inflated cells also present. Hyphae of pileus trama rusty cinnamon
in KOH and with incrusting material on the wall. Pileus cuticle a layer of
inflated cells about 2 deep, the walls pale cinnamon to hyaline, thin.
Type locality. McLeod near Trail, Jackson County, Oregon.
Habit and habitat. Scattered to gregarious on mossy oak trunks or logs,
November.
Distribution. Oregon.
Observations. This species is close to P. fulvescens but regularly, when revived
in KOH, shows the refractive particles in the forward part of the cystidium, or,
lacking these, a droplet.
Material examined. Oregon: Smith 55377, 55689 (Type), 55690.
342. Psathyrella distans A. H. Smith, sp. nov.
Pileus 2-3.5 cm latus, late convexus, glaber, cinnamomeo-brunneus, ad
marginem demum incarnatus; lamellae distantes, latae (7-8 mm), rufo-fulvae;
stipes 4-5.5 cm longus, 2.5-3 mm crassus, pallidus, sparse fibrillosus; velum
sparsum; sporae 7-9.5 x 4-5 A; pleurocystidia 40-65 x10-15 (-17) t, fusoide
ventricosa, obtusa vel rotundata; fibulae adsunt. Typus. Smith 14268 (MICH);
legit prope Lake Mills, Port Angeles, Washington.
Illust. Text Figs. 740-742.
Pileus 2-3.5 cm broad, obtuse becoming convex to hemispheric, glabrous, moist,
hygrophanous, cinnamon-brown or in age more or less lead color near the margin,
fading to "pale pinkish buff" or "pinkish buff" (pale buff to faintly alutaceous)
or developing a pinkish tinge toward the margin when faded, surface rugulose
and atomate in faded pilei. Context thin and fragile, odor and taste not distinctive.
Lamellae distant, 15-17 reach the stipe, 2 tiers of lamellulae, broad (7-8 mm),