The North American species of Psathyrella.

350

MEMOIRS OF THE NEW YORK BOTANICAL GARDEN

[VOL. 24

near apex where an occasional subechinulate protrusion occurs, hyaline, thinwalled, cell content not distinctive in KOH or Melzer's. Cheilocystidia vesiculose
and up to 25 /i broad occasionally, or elliptic in optical section, or clavate or
utriform, all thin-wall, smooth and hyaline. Caulocystidia a mixture of cells
resembling the pleurocystidia and the cheilocystidia but often larger.
Pileus with hyphae of the subcuticular zone heavily incrusted with patches of
vinaceous-brown pigment as amorphous material (in KOH). Cuticle of pileus a
staggered palisade of vesiculose and broadly clavate hyaline smooth cells, cell
content not distinctive, the layer 1-2 cells deep. Clamp connections present.
Type locality. French Creek Grade, near Burgdorf, Idaho.
Habit and habitat. Gregarious on conifer duff.
Distribution. Idaho.
Observations. The dried basidiocarps have the colors of those of P. longistriata
but the spores and the lack of a veil easily distinguish it. The tendency of the
pleurocystidia to develop subechinulate processes is a most interesting feature in
this species.
322. Psathyrella georgiana A. H. Smith, sp. nov.
Pileus 1-2.5 cm latus, convexus vel subplanus, glaber, rufo-fulvus demiim
fulvo-cinnamomeus, dein subalutaceus; lamellae confertae, adnatae, pallidae
demum griseo-fuscae ad acierum demum incarnatae; stipes 1-5 cm longus,
1-1.8 mm crassus, pallidus, deorsum demum brunneus, sparse fibrillosus, glabrescens; sporae 6.5-8x3.5-4.5 p; pleurocystidia 30-42x10-14 g, utriformia vel
fusoide ventricosa ad apicerum late rotundata; fibulae adsunt. Typus. Smith 3983
(MICH); legit prope Pinckney, Michigan.
Illust. P1. 60, fig. b; Text Figs. 695-698.
Pileus 1-2.5 cm broad, obtusely conic, margin appressed at first, expanding to
convex or plane, surface glabrous, partial veil rudimentary and all traces soon
vanishing from the margin of the pileus, at first a faint fringe present, moist, color
"russet" to "cinnamon-brown" (rusty brown) or even "Sayal brown" to
"cinnamon-buff" (dark cinnamon to yellowish brown to sordid tan progressively
before fading), hygrophanous, fading to pallid buff with an ochraceous tinged disc,
atomate when faded and the margin sulcate to somewhat crenate, translucent
striate when moist, when remoistened or in age dark umber-brown over all.
Context very thin and very fragile, odor and taste not distinctive.
Lamellae close, adnate, moderately broad, thin and very fragile, not deliquescing, pallid when young, then grayish in age "wood brown" or darker (dark
avellaneous), edges pallid at first but stained vinaceous in age.
Stipe 1-5 cm long, 1-1.8 mm thick, equal, very fragile, hollow, whitish, base
sordid to dull watery brown, surface at first with scattered patches of fibrils but
soon glabrous.
Spores 6.5-8 x 3.5-4.5 g, smooth, apical pore small and apex not truncate, shape
in face view ovate to elliptic, in profile obscurely inequilateral to subovate, color
in KOH dull cocoa-color slowly becoming dark chocolate-color, in Melzer's
reddish tawny, wall about 0.2, thick.
Basidia 4-spored, 13-17x7-9 1, clavate but pedicel short, projecting onefourth their length when sporulating, hyaline in KOH. Pleurocystidia scattered,
30-42 x 10-14 /, utriform to fusoid-ventricose with broadly rounded apex, wall
thin, smooth and hyaline, cell content not distinctive in KOH or Melzer's. Cheilocystidia similar to pleurocystidia or broader and with shorter neck, some clavate