The North American species of Psathyrella.

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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN

[VOL. 24

143. Psathyrella subaustralis A. H. Smith, sp. nov.
Pileus 18-21 mm latus, campanulatus, subspadiceus, striatus, fibrillososquamulosus, glabrescens; velum pallide griseum; lamellae 2.5-3 mm latae,
demum subdistantes; argillaceae; stipes 15-20 mm longus, 0.5-3 mm crassus,
albidus, albo-floccosus, glabrescens; sporae 8-10.5x6-7.5(-8),; cheilocystidia
18-28x8-14 Mu, clavata vel saccata. Typus. Singer F792 (MICH); legit prope
South Miami, Dade County, Florida.
Pileus 18-21 mm broad, campanulate becoming plane, "bister" on the disc,
much paler on margin between the translucent striations, with scattered floccose
patches of outer veil remnants at first, soon glabrescent, veil pale grayish. Context
very thin and fragile, odor none.
Lamellae adnexed, moderately broad (2.5-3 mm), moderately close to subdistant, subventricose-horizontal, argillaceous.
Stipe 15-20 mm long, 0.5-3 mm thick, equal or tapering upward, white, hollow,
veil remnants floccose and white.
Spores 8-10.5x6-7.5(-8) /, smooth, apical pore indistinct, ovate to nearly
elliptic in face view, in profile subelliptic to obscurely inequilateral, color in KOH
nearly hyaline to slightly yellowish tinged, scarcely darkening, wall 0.2 /I thick
approximately.
Basidia 4-spored, 17-20 x9-11 A, short and broad, hyaline in KOH. Pleurocystidia none. Cheilocystidia clavate to saccate or broadly fusoid-ventricose,
18-28x8-14 I, hyaline, smooth and thin-walled in KOH, content of cell not
distinctive.
Gill trama dingy yellowish in KOH but not reviving well, apparently composed of more or less inflated cells irregularly arranged. Pileus having a cuticle
of vesiculose cells one cell deep, pale yellowish in KOH. Hyphae of context
yellowish in KOH.
Type locality. West of South Miami, Dade County, Florida.
Habit and habitat. On naked earth in crab holes in pure stand of Myrica in
backwater region, September.
Distribution. Known only from the type locality.
Observations. The grayish veil, spores practically hyaline in KOH, and the
argillaceous gills are a distinctive combination of features.
144. Psathyrella lanuginosa A. H. Smith, sp. nov.
Pileus 4-9 mm latus, demum campanulatus, copiose fibrilloso-squamulosus,
glabrescens, ad marginem fimbriatus vel appendiculatus, albidus, demum griseobrunneus; lamellae confertae, latae pallidae demum rufo-brunneae; stipes 1-2 cm
longus, 1 mm crassus, albo-fibrillosus; sporae 8-11x5-6 t; cheilocystidia 28 -43 x9-14 p, clavata vel fusoide ventricosa; fibulae adsunt. Typus. Smith 10973
(MICH); legit prope Milford, Michigan.
Illust. Text Figs. 320, 321.
Pileus 4-9 mm broad, obtuse to campanulate, the umbo at times conic and
rather abrupt, surface at first densely covered with coarse appressed fibrils from
the remains of the white outer veil, the fibrils often arranged in fascicles around
the disc, the margin fringed to appendiculate, glabrescent, white when young
(beneath the fibrils), near avellaneous to wood brown as spores mature, coarsely
striate before fading, pallid buff when faded. Context thin, whitish, very fragile,
odor and taste not distinctive.