The North American species of Psathyrella.

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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN

[VOL. 24

Pileus cuticle of vesiculose cells with thin walls. No other details obtainable.
Type locality. Hope Gardens, Jamaica.
Habit and habitat. Scattered on decayed banana stalk.
Distribution. Known only from the type locality.
Observations. The shining white stipe, very small spores, and rather broad
crowded gills are distinctive. It is not clear just what is meant by "pinkish" in the
original description.
245. Psathyrella musae (Earle) A. H. Smith, comb. nov.
Gymnochilus musae Earle, Inf. An. Estac. Centr. Agron. Cuba 1: 239. 1906.
Hypholoma musae (Earle) Morgan. Jour. Mycol. 14: 28. 1908.
Atylospora musae (Earle) Murrill, Mycologia 10: 21.1918.
Illust. Earle, 1. c. pl. 37, fig. 2. Text Fig. 540.
Pileus 1-3 cm broad, convex, then expanded, silky, striatulate, hygrophanous,
pale ochraceous tinged with purple-brown, becoming pallid or whitish when dry
(faded). Context thin, watery, fragile.
Lamellae narrow, crowded, adnexed, whitish at first, becoming purnle-brown.
Stine 3-6 cm long, 2 mm thick, slender, fragile, hollow, white, glabrous, the
apex slightly mealy and the base mycelioid.
Spores 6-7.5x4-4.5 /, smooth, apex with a broad often bulging (in KOH)
apical pore, shape in face view oblong to elliptic or slightly ovate, in profile
obscurely inequilateral to subelliptic, color in KOH pale yellowish avellaneous
when first revived in KOH, slowly darkening, in Melzer's ochraceous-tawny,
wall -0.2 x thick.
Basidia 4-spored, 12-16X 5-6 /, hyaline in KOH. Pleurocystidia not found.
Cheilocystidia scattered, 26-32 x10-12 a, ventricose with broadly rounded
apex, hyaline, thin-walled, smooth, readily collapsing.
Pileus with a cuticle of vesiculose cells hvaline in KOH and thin-walled.
Context hyaline to brownish as revived but hyphae reviving very poorly. Clamps
present on hyphae of the cortex of the stipe.
Type locality. Cuba.
Habit and habitat. Subcespitose on fallen dead stems and leaves of banana
trees.
Distribution. Cuba.
Observations. The combination of features which apparently distinguish this
species is: The lack of a veil, the pale ochraceous pileus, crowded narrow lamellae,
small spores and in particular their pale color when first revived in KOH. The
question of pleurocystidia needs to be restudied from fresh material.
246. Psathyrella plana (Murrill) A. H. Smith, comb. nov.
Atylospora plana Murrill, Mycologia 10: 24. 1918.
Psathyra plana (Murrill) Murrill, Mycologia 10: 33. 1918.
Illust. Text Figs. 541, 542.
Pileus 2 cm broad, expanded, almost perfectly plane, surface striate, glabrous,
avellaneous-isabelline, becoming isabelline when dry (faded), margin concolorous,
subentire, recurved in drying. Context very thin and delicate.
Lamellae adnate, narrow, crowded, becoming purplish brown, whitish on the
edges.
Stipe 3 cm long, 2 mm thick, slender, equal, smooth, glabrous, snow-white,
yellowish when dried.