The North American species of Psathyrella.

388 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [VOL. 24
sparsely fibrillose over lower part but soon glabrescent, base somewhat mycelioid.
Spores 7-9(-10) x 4-5(-5.5) A, smooth, apical pore small and apex not truncate, shape in face view elliptic to ovate, in profile somewhat bean-shaped to
obscurely inequilateral, color revived in KOH dull cocoa-color becoming chocolategray slowly, in Melzer's near ochraceous-tawny, wall about 0.3 [ thick.
Basidia 4-spored, 17-22 x 7-9 I,, clavate, hyaline in KOH. Pleurocystidia
(38-)45-58(-68) x 9-14 a, fusoid-ventricose with long often flexuous necks and
an obtuse apex, wall thin, smooth and hyaline, cell content not distinctive in
KOH or Melzer's. Cheilocystidia similar to pleurocystidia but usually shorter
and varying to simply clavate or vesiculose and 8-14 u/ broad. Caulocystidia
resembling the cheilocystidia (all types present) and some fusoid-ventricose with
acute apex.
Gill trama of irregularly arranged large inflated but somewhat elongated cells
cocoa-brown to pale brownish in KOH, slowly fading to nearly hyaline. Pileus
trama of enlarged hyphae, their walls pale brownish with a tinge of cocoa-color
when first mounted but soon fading, smooth to minutely roughened, color more
accentuated in immature pilei. Cuticle of pileus a layer of greatly inflated more
or less globose hyaline to yellowish cells in KOH some of which have a short broad
pedicel. Clamps present.
Type locality. France.
Habit and habitat. Scattered on hardwood logs or the debris beside them.
Distribution. Maine, Michigan, Washington, Wyoming.
Observations. There remains some question as to whether this concept actually
includes Romagnesi's species, but the correspondence in most characters is too
great to be disregarded. Also, we have a number of variants in North America
deserving further study. Ammirati 3258, 3259, 3260 all possessed a raphanoid
taste.
Material examined. Maine: Bigelow 3744. Michigan: Ammirati 2727, 2763,
2837, 3253, 3258, 3259, 3260; Foray-1948; Homola 1117; Hoseney 288; Potter
4621, 4797, 5055, 5180, 5988, 8638, 8601; Smith 11037, 18907, 21421, 25277, 25426,
25496, 25613, 28760, 31947, 43326, 58232, 63449, 63481, 66687, 72933, 78189.
Washington: Smith 14253, 29516. Wyoming: Smith 34723.
363. Psathyrella camphorata A. H. Smith, sp. nov.
Pileus 8-15 mm latus, obtuse conicus, tenuiter fibrillosus, glabrescens, melleobrunneus deinde subalbidus; fragilis; odor aromaticus; lamellae confertae, latae,
pallidae; stipes 2-3 cm longus, 1-mm crassus, tenuiter fibrillosus, glabrescens;
sporae 6.5-7.5 x 3.8-4.5 /; pleurocystidia 33-52 x 9-15 a, fusoide ventricosa, subacuta. Typus. Smith 57711 (MICH).
Illust. Text Figs. 795-797.
Pileus 8-15 mm broad, obtusely conic, broadly conic in age, margin straight
at first and thinly coated with grayish fibrils when young, color pale honey-color
at first but becoming chocolate-gray as spores mature, hygrophanous, fading to
whitish, striate when moist. Context very thin and fragile, taste mild, odor
distinctly of spirits of camphor.
Lamellae close, broad, adnate, seceding, pallid becoming dull cocoa-color,
edges even.
Stipe 2-3 cm long, 1 mm thick, equal, fragile, pallid above, becoming honeycolor below, faintly fibrillose over lower half from a thin veil, pruinose near apex.
Spores 6.5-7.5x3.8-4.5 ak, smooth, apical pore indistinct but apex flattened