The North American species of Psathyrella.

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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN

[VOL. 24

Basidia 4-spored, 28-32 x 12-13 /, subcapitate, hyaline in KOH. Pleurocystidia scattered, 40-62x 10-18 a, subclavate to broadly ventricose or elliptic
in optical section above a narrowed pedicel, apex broadly rounded, often with
adhering globules around the outside of the neck or over apex, walls very slightly
thickened at least in the basal portion and also slightly tinged brownish to
vinaceous as revived in KOH (at times). Cheilocystidia essentially like the
pleurocystidia but smaller. Caulocystidia variable, in patches, clavate, subutriform, fusoid-ventricose, or with protuberances variously placed, walls thin,
smooth and hyaline, content not distinctive.
Gill trama hyaline to very pale dingy brownish in KOH. Pileus very pale
sordid brownish in KOH; the cuticle of vesiculose cells several deep and with
walls thin, hyaline and smooth, cell content not distinctive. Clamp connections
present. No distinctive reactions on any tissue when mounted in Melzer's.
Type locality. Edwards County, Kansas.
Habit and habitat. Subcespitose on soil in a pile of corncobs.
Distribution. Known only from the type locality.
Observations. It is not yet determined for certain that this species should be
placed with barnyard inhabiting forms, but certainly the probability lies in that
direction. It is named in honor of Dr. Travis E. Brooks, the collector.
150. Psathyrella salmonescens A. H. Smith, sp. nov.
Pileus 1-2 cm latus, late convexus, sparse albo-fibrillosus, demum subsquamulosus, glabrescens, badius vel castaneus, dein sordide incarnatus; lamellae
confertae latae, dilute brunneae demum fumoso-fuscae; stipes 2-3 cm longus,
1-2 mm crassus, subbadius, fibrillosus; sporae 10-13x5.5-6.5 u; pleurocystidia
44-56 x 10-18,f, subutriformia vel late fusoide ventricosa; fibulae adsunt. Typus.
Smith 5023 (MICH); legit prope Stockbridge, Michigan.
Illust. Text Figs. 337, 339, 340.
Pileus 1-2 cm broad, obtuse to convex, broadly convex in age, at first thinly
coated by white fibrils which aggregate into fascicles as pileus expands, the margin
straight at first and fringed with veil fibrils, glabrescent, when moist "bay" to
"chestnut" (dark red-brown), hygrophanous, fading to "salmon-buff" (a dingy
pink) or with a stronger red tinge. Context thin, rufous tinged, fragile, odor and
taste not distinctive.
Lamellae close, broad, adnate, pale brownish, finally dark smoky brown, edges
white-fimbriate.
Stipe 2-3 cm long, 1-2 mm thick, equal, tinged reddish brown beneath the
fibrils, pruinose above, glabrous in age, at first the tubule stuffed with a white pith.
Spores near "benzo brown" in deposit, 10-13x5.5-6.5 pA, smooth, apical pore
distinct and apex truncate, shape in face view elliptic to subovate, rarely suboblong, in profile subelliptic to obscurely inequilateral, color in KOH coffee-bean
brown quickly changing to dark chocolate-color, in Melzer's dark bay-red, wall
about 0.5,u thick.
Basidia 4-spored, 18-23 x 6-9 A, clavate, hyaline in KOH. Pleurocystidia
44-56 x 10-18 I, subutriform to broadly fusoid-ventricose with rounded to obtuse
apex, wall smooth, thin and hyaline, content not distinctive in KOH or Melzer's,
apex in some divided into 2-3 obtuse protuberances and in some the apex of the
protuberance subacute. Cheilocystidia similar to pleurocystidia or more ventricose and with narrower neck terminating in a subacute apex, some vesiculose cells
also present. Caulocystidia very rare, and those seen were merely scattered,