The North American species of Psathyrella.

1972]

PSATHYRELLA

405

381. Psathyrella cokeri (Murrill) A. H. Smith, comb. nov.
Psilocybe cokeri Murrill, Mycologia 15: 12. 1923.
Illust. Text Figs. 826-828.
Pileus 1-2.5 cm broad, convex to campanulate, not fully expanding, margin
incurved when young, surface glabrous, light grayish tan, slightly striate on the
margin. Context very thin and fragile, odor and taste not recorded.
Lamellae adnate, rather broad, subcrowded, smoky brown, becoming darker
with age, dark vinaceous-brown as dried.
Stipe 5-7 cm long, 2-3 mm thick, equal, smooth, subcartilaginous, hollow,
whitish to dirty pallid flesh-color.
Spores 6-7.5(-8) x 3.2-4,/, smooth, apical pore distinct (under oil) but apex
only obscurely truncate, shape in face view elliptic to ovate varying to nearly
oblong, in profile obscurely inequilateral to obscurely bean-shaped, color in KOH
dark bister slowly becoming dark chocolate-brown, in Melzer's reddish tawny,
wall about 0.3 pL thick.
Basidia 4-spored, 12-14x6-8 u, hyaline in KOH, short and obese. Pleurocystidia scattered, 42-58 x 10-13 A, fusoid-ventricose with obtuse to subacute apex,
smooth, hyaline, thin-walled, cell content not distinctive. Cheilocystidia similar
to pleurocystidia but many shorter and with broader necks. Caulocystidia in
clusters, resembling the cheilocystidia.
Pileus having a cuticle of vesiculose cells one to two cells deep, their walls
thin, smooth, and hyaline to yellowish revived in KOH. Hyphae of the context
not appreciably colored (in KOH). Clamps present.
Type locality. Chapel Hill, North Carolina.
Habit and habitat. Solitary to gregarious on moist soil mixed with humus.
Distribution. Michigan, North Carolina.
Observations. There is a question in my mind as to just how "flesh colored"
the stipe actually is when it is perfectly fresh. The small spores, however, and
lack of pigmentation in the hyphae of the subcuticular region of the pileus as
revived in KOH seem to be reliable features and prevent reference of the species
to P. fulvescens or to members of the series Limicolae.
Material examined. Michigan: Potter 9023; Smith 23397, 32164. North
Carolina: Murrill's Type.
382. Psathyrella incondita A. H. Smith, sp. nov.
Pileus 1-2.5 cm latus, late conicus, sparse fibrillosus glabrescens, subspadiceus;
contextu fulvus; lamellae confertae, latae, griseae; stipes 4-6 cm longus, 1.5-3 mm
crassus, pallidus, deorsum brunneus, minute fibrilloso-floccosus glabrescens; velum
sparsum; sporae 6-7.5 x 3.2-3.8 (-4) u; pleurocystidia 42-60 x8-12 u; subcylindrica vel anguste fusoideo-ventricosa; fibulae adsunt. Typus. Smith 13851
(MICH); legit prope Lake Crescent, Washington.
Illust. Text Figs. 824, 825.
Pileus 1-2.5 cm broad, obtusely conic when young, becoming broadly conic in
age or expanding to campanulate, surface at first with a few fugaceous white fibrils
from the remains of the rudimentary veil, soon glabrous over all, "buckthorn
brown" to watery "clay color" when moist, hygrophanous, fading to near
"vinaceous-buff" or pallid, radially rugulose when faded. Context thin and fragile, watery rusty brown when fresh, paler faded, odor not distinctive, taste mild.
Lamellae moderately close, 22-24 reach the stipe, bluntly adnate and soon