The North American species of Psathyrella.

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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN

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attributed "fast rundlich" spores to the European species. Peck's species differs
from P. sublateritia in narrower spores, in the cheilocystidia, and in a generally
more slender stature. There is a delicate difference in the color of the spore deposit
also, that of Peck's species being pinker.
Material examined. UNITED STATES. Michigan: Ammirati 2300; Bartelli
2009, 2305; Gillanders 8-26-67; Kauffman 9-1-06; Mains 32-744; Mazzer
7-14-67; Shaffer 3727; Smith 32731, 32985, 34033, 37232, 38466, 39150,
39430, 41351, 41712, 42210, 49709, 57375, 63902, 67008, 72330, 74645, 74695,
75628, 75670, 77577, 78064, 9-18-29. New York: Peck's type. Tennessee: Hesler
4367. Virginia: Kelly 1724. CANADA. Ontario: Kelly 1311, 1366 Aug. 1921;
Smith 4479.
201. Psathyrella naucoria A.H. Smith, Mycologia 42: 126. 1950.
Illust. 1. c. fig. 18e, f, g, h, i. P1. 70, fig. b; P1. 78, fig. c; Text Figs. 467-469.
Pileus 1-3 cm broad, broadly convex with an incurved margin, becoming plane
or the margin uplifted, glabrous, when moist striatulate on the margin, hygrophanous "cinnamon brown" (dark cinnamon) moist, fading to "cinnamon-buff"
or "pinkish buff," fading on the disc first. Context thin but relatively firm,
pallid, no odor or taste worthy of mention.
Lamellae pallid when young, soon tinged cinnamon and becoming dark
cinnamon-brown, finally with a purplish red tinge, close to crowded, narrow,
horizontal and bluntly adnate, becoming shallowly adnexed, edges even.
Stipe short, 1-2.5 cm long, 2-3 mm thick at apex, usually curved, glabrous,
stuffed with a pallid to white pith, distinctly cartilaginous-pliant, rather than
fragile, surface pruinose above, pallid honey-color young, cinnamon-buff or
darker in age, base slightly mycelioid; veil none.
Spore deposit dark vinaceous-brown ("Verona brown"). Spores 5-5.8(-6) X
3.5-4x 4-4.7(-5) /u, smooth, apical pore minute and inconspicuous, shape in face
view subovate to subcircular, in profile subelliptic to somewhat ovate, very pale
under the microscope as revived in H20 or when fresh, in KOH becoming cocoagray, in Melzer's reddish to tan, wall thin.
Basidia 4-spored, 15-17 x 5.5-6.3 /i, hyaline in KOH. Pleurocystidia abundant,
28-36 x 8-14 /, fusoid-ventricose to ventricose-mucronate, thick-walled at least
in the narrowed portion, apex usually incrusted with an exudate, hyaline in KOH.
Cheilocystidia similar to pleurocystidia or 26-34 x 10-16 gu, clavate or vesiculose.
Pileus with a cuticle of an irregular palisade of clavate cells from between
many of which clavate to subcylindric pileocystidia arise, the latter sometimes
elongated into filaments. Trama hyaline in KOH. Clamp connections present.
Type locality. Mt. Rainer National Park, Washington.
Habit and habitat. Gregarious to scattered on very decayed alder logs,
lower Nisqually River, August.
Distribution. Known only from the type locality.
Observations. This species closely resembles P. camptopoda in habit, habitat
on hardwood logs, pale spores under the microscope, thick-walled pleurocystidia
and stature. It differs chiefly in its much broader spores in face view.
Material examined. Idaho: Smith 54450. Washington: Smith 29785 (Type),
30238,49059.