The North American species of Psathyrella.

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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN

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wall thickening also present. Caulocystidia in clusters, similar to pleurocystidia,
rather abundant.
Gill trama of regularly arranged much enlarged cells sordid to brownish to
hyaline in KOH, subhymenium cellular, hyaline. Pileus having a cuticle of
hyaline vesiculose cells 10-30 u wide and about 3-4 cells deep, wall thin, smooth
and hyaline, content not distinctive in KOH or Melzer's. Hyphae of the trama
cocoa-colored to nearly hyaline in KOH in the subcuticular region, paler toward
the subhymenium. Clamp connections present. No distinctive reactions on any
tissue mounted in Melzer's.
Type locality. Knoxville, Tennessee.
Habit and habitat. On a lawn, gregarious, September.
Distribution. Known only from the type locality.
Observations. This species has somewhat the aspect of P. subagraria, particularly in its coloration, but the thick-walled cystidia separate it at once. It
differs from P. spadicea in habit, presence of an outer veil, and in color of the
spores in KOH.
207. Psathyrella cystidiosa (Peck) A. H. Smith, comb. nov.
Psilocybe cystidiosa Peck, Bull. N.Y. State Mus. 167: 46. 1913.
Illust. Text Figs. 482-484.
Pileus 2-4 cm broad, convex or subconic, surface glabrous, hygrophanous, pale
brown when moist, yellowish drab with a brownish center and sometimes obscurely striate on the margin when dry, becoming lacerate at times when expanded.
Context white, with a nutty taste.
Lamellae adnate, crowded, thin, whitish becoming purplish brown.
Stipe 4-5 cm long, 2-4 mm thick, equal or slightly tapering upward, hollow,
pruinose at the top, white, often with a subglobose mass of earth adhering to
the base.
Spores 7-9.5 x 4-5, smooth, apex with a distinct pore but the apex not
truncate, shape in face view oblong to elliptic, in profile suboblong to elliptic
or slightly bean-shaped, color in KOH chocolate-brown and darkening somewhat
on standing.
Basidia 4-spored, 14-18 x 6-8 /, clavate, hyaline in KOH. Pleurocystidia very
abundant, 60-80 X 12-20 g, smooth, thick-walled, arising from deep in the gill
trama, hyaline in KOH, fusoid to fusoid-ventricose, the apex subacute to acute
and filled with wall material. Cheilocystidia similar to pleurocystidia but smaller
and also in the form of vesiculose to clavate cells 26-37 X 10-15 g, these thinwalled and hyaline to yellowish in KOH.
Gill trama with a central cinnamon-brown strand of hyphae flanked on either
side by hyaline pseudoparenchymatous tissue. Pileus having a cuticle one to two
cells deep composed of vesiculose elements with hyaline smooth, thin walls and
the cell content not distinctive. Hyphae of the trama as revived in KOH pale
cinnamon-brown.
Type locality. Minneapolis, Minnesota.
Habit and habitat. Solitary to cespitose.
Distribution. Known only from the type locality.
Observations. Data not obtained from the type when it was studied over
twenty years ago have been supplemented by data as follows from "co-type"
material sent to Kauffman by Dr. Whetstone: The spores are tawny in Melzer's,
measure 7-10 x 4-5 /, are chocolate-brown in KOH, and many are obscurely