The North American species of Psathyrella.

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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN

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392a. Psathyrella limicola var. subpectinata A. H. Smith, var. nov.
Pileus 1.5-3 cm latus, late conicus vel convexus, glaber, cinnamomeo-brunneus,
ad marginem demum sulcatus; lamellae late, confertae, brunneolae demum fulvobrunneae; stipes 1-2.5 cm longus, 1-2 mm crassus, pallidus, sparse fibrillosus
glabrescens; sporae 7-9(-10) x4-4.5 t; pleurocystidia 34-46x9-13 pa, obtuse
fusoideo-ventricosa; fibulae adsunt. Typus. Smith 34407 (MICH); legit prope
French Creek, Medicine Bow National Forest, Wyoming.
Pileus 1.5-3 cm broad, obtuse to convex and expanding to broadly conic to
convex, surface moist and glabrous, near cinnamon-brown moist, hygrophanous
and fading to near pinkish buff, margin faintly translucent striate moist, becoming
sulcate in mature caps on the margin in drying. Context thin, fragile, odor of
mushrooms (Agaricus campestris) and taste similar to that species.
Lamellae adnate-seceding, broad, close, pallid brownish at first, at maturity
cinnamon-brown.
Stipe short, 1-2.5 cm long, about 1-2 mm thick, equal, whitish, not discolored
appreciably in aging, faintly fibrillose at first but soon glabrous, apex faintly
fibrillose-pruinose.
Spores 7-9(-10) x 4-4.5 ~/, smooth, apex with an inconspicuous pore and the
contour of the apex not flattened, shape in face view elliptic varying to ovate or
oblong, in profile obscurely inequilateral varying to subelliptic or slightly beanshaped, a few abnormal spores with a snoutlike apical protrusion and having a
distinct pore at the apex, color in KOH bister to dull cocoa-color slowly becoming
chocolate-brown to fuscous, in Melzer's tawny, wall about 0.3 [ thick.
Basidia 4-spored, 13-16x8-9 I, ellipsoid, hyaline. Pleurocystidia scattered,
34-46 x 9-13 A, fusoid-ventricose, apex obtuse, wall with granules adhering near
apex at first but soon smooth (KOH mounts), thin, hyaline, cell content not distinctive. Cheilocystidia similar to pleurocystidia or clavate to hyaline, 8-12 ju
wide. Caulocystidia scattered or in groups similar to the cheilocystidia (all types
present).
Gill trama dingy ochraceous in KOH fading to hyaline, cells of hyphae greatly
inflated. Pileus trama rusty brown in KOH but fading and on mature caps color
usually weak. Cuticle of pileus a layer of inflated cells about 1 cell deep, their
walls hyaline to ochraceous and smooth. Clamp connections present.
Type locality. Lower French Creek, Medicine Bow National Forest, Wyoming.
Habit and habitat. Gregarious on wet soil along stream.
Distribution. Wyoming.
Observations. This variety has slightly smaller spores than the type variety
and the apex is not truncate under equivalent magnification.
393. Psathyrella warrenensis A. H. Smith, sp. nov.
Pileus 1-4 cm latus, convexus, glaber, castaneus; lamellae latae, demum subdistantes, pallidae demum brunneolae dein violaceo-fuscae; stipes 4-6 cm longus,
2-3.5 mm crassus, pallidus, deorsum brunneus, glaber; velum nullum; sporae
8-10x 4-5 t; pleurocystidia 36-47 (-55) x 8-12 (-14) /, anguste fusoide
ventricosa; fibulae adsunt. Typus. Smith 70162 (MICH); legit prope Warren,
Idaho.
Illust. Text Figs. 842-845.
Pileus 1-4 cm broad, obtuse to convex becoming plane, margin straight and
lacking veil remnants, surface glabrous, moist, hygrophanous, rich chestnut