The North American species of Psathyrella.

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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN

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cinnamon-colored pileus beneath the veil, the somewhat inequilateral spores in
profile (this is unusual in a spore of this size), and their dark color in KOH. As
for a number of species, this one is ambiguous between subsection Hydrophilae
and subsection Pannucia.
87. Psathyrella tubarioides A. H. Smith, sp. nov.
Pileus 1-3.5(-4) cm latus, obtusus vel convexus demum late convexus, ad
marginem squamulosus et appendiculatus, glabrescens, sordide cinnamomeus;
lamellae subdecurrentes, angustae, confertae, dilute cinnamomeae demum lignobrunneae (fusco-brunneae); stipes 3-5 cm longus 1.5-4 mm crassus, albidus,
deorsum sparse fibrillosus; sporae 7-9(-10) x4-4.5 u; pleurocystidia 44-55
(-60) X 12-18 p,, fusoide ventricosa, ad apicerum late obtusa; fibulae adsunt.
Typus. Smith 50994 (MICH); legit prope Pellston, Emmet County, Michigan.
Illust. Text Figs. 215-217.
Pileus 1-3.5(-4) cm broad, obtuse to convex, expanding in broadly convex or
flattened over the disc, outer veil leaving squamules and patches over the marginal
half of the pileus and the edge appendiculate, soon glabrescent, color when moist
dingy cinnamon fading to pale tan. Context thin and fragile, odor not distinctive.
Lamellae broadly adnate to subdecurrent, close, narrow and equal, pallid
cinnamon when young, duller cinnamon before clouded from the spores, retaining
a reddish cinnamon cast in drying.
Stipe 3-5 cm long, 1.5-4 mm thick, equal, hollow, fragile, white throughout,
at first sparsely fibrillose from veil remnants, pruinose at apex.
Spores 7-9(-10) x 4-4.5 p, smooth, apical pore indistinct but apex blunt to
subtruncate, shape in face view ovate to narrowly subelliptic to oblong, in profile obscurely inequilateral to ovate or suboblong, color in KOH ochraceoustawny, darkening very slowly, in Melzer's pale ochraceous-tawny, wall about
0.2 p thick.
Basidia 4-spored, 18-24x7-9 x, clavate, hyaline in KOH. Pleurocystidia
44-55 (-60) x 12-18 I, abundant, fusoid-ventricose with rounded apex, rarely with
1-2 protuberances, apex in some merely obtuse, wall thin and hyaline, apical region
often with adhering refractive debris, cell content not distinctive in KOH or in
Melzer's. Cheilocystidia smaller than pleurocystidia but otherwise similar but
cells about 60 x 20 I often numerous in local areas; clavate to short-fusoid cells
also present, all cells hyaline as revived in KOH.
Gill trama regular, hyphae hyaline and smooth, cells greatly inflated and tending to remain collapsed. Cuticle of pileus a cellular layer 3-6 cells deep, walls
thin, smooth and hyaline to weakly ochraceous in KOH, cell content not distinctive. Hyphae of subcutis dingy tawny when revived in KOH but quickly
fading, walls smooth. No distinctive reactions noted for any part in Melzer's.
Clamp connections present.
Type locality. Hardwood State Forest, west of Pellston, Michigan.
Habit and habitat. Subcespitose on rotting hardwood logs, October.
Distribution. Emmet County, Michigan.
Observations. The gills as dried are about the color of those of P. spadicea,
and in some spores a slight medial constriction is present. Smith 63484 apparently
belongs here. It has pale ochraceous-tawny spores as revived in KOH and a
cinnamon-buff veil. The pleurocystidia are merely obtuse.
Material examined. Michigan: Smith 50994 (Type), 63484, 75554.