The North American species of Psathyrella.

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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN

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Pileus 2-4 cm broad, obtuse with a curved in margin when young, expanding
to campanulate or obtusely umbonate with finally a more or less spreading
margin, surface glabrous except for the edge which at first is denticulateappendiculate from white veil fragments, color a grayish clay color to dull tawnybrown, hygrophanous and fading to dingy tan but soon generally a pinkish-pallid,
when dried near "snuff brown." Context thin, concolorous, fragile, odor not
distinctive.
Lamellae close, moderately broad, nearly equal, adnate, dingy brown becoming very dark purple-brown from the spores and blackish brown as dried (about
like those of P. velutina), edges whitish.
Stipe 3-5 cm long, 3-5 mm thick, equal to a slightly thickened base, fragile,
hollow, white over all, dingy pale brownish as dried, fibrillose over lower half at
first, glabrescent.
Spores 7-9 x 4-4.5 /, smooth, apical pore small but apex weakly truncate, in
face view elliptic to suboblong, in profile subelliptic to obscurely inequilateral,
color in KOH deep garnet brown becoming dark chocolate-color, in Melzer's
merely tawny, wall about 0.3 Ju thick.
Basidia 4-spored, 8-10, wide, subellipsoid to clavate, hyaline. Pleurocystidia
40-56 x 10-16 A, fusoid-ventricose with subacute to obtuse apex, wall thin, smooth
and hyaline, cell content not distinctive. Cheilocystidia similar to the pleurocystidia but smaller, and many clavate-inflated cells 9-13 /t wide present, walls
hyaline to yellowish.
Cuticle of pileus 2-3 cells deep, walls thin, smooth and hyaline to yellowish
in KOH, cell content not distinctive. Hyphae of the context yellowish in the
subcuticular zone (in KOH), walls smooth. Clamp connections present.
Type locality. Tahquamenon Falls State Park, Luce County, Michigan.
Habit and habitat. Subcespitose on hardwood logs.
Distribution. Known only from the type locality.
Observations. The dark gills are a distinctive feature among the woodinhabiting species of this subsection. It seems to be closest to P. septentrionalis
but is distinguished by its paler pileus, the garnet brown colored spores as first
revived in KOH, and more subacute pleurocystidia.
121. Psathyrella lanatipes A. H. Smith, sp. nov.
Pileus 2-4 cm latus, late convexus vel subplanus, floccoso-fibrillosus, glabrescens, ad marginem appendiculatus, spadiceus vel subcinnamomeo-brunneus;
lamellae adnatae, latae subdistantes; stipes 6-8 cm longus, (2-)3-5 mm crassus,
fragilis; albidus, floccoso-fibrillosus, glabrescens; sporae 8-10 x4-5 /; pleurocystidia (46-) 52-70x 9-15 /, fusoide ventricosa, acuta vel subacuta; fibulae
adsunt. Typus. Smith 24457 (MICH); legit prope Rhododendron, Oregon.
Pileus 2-4 cm broad, convex when young the margin curved in slightly,
expanding to nearly plane, surface at first covered by fibrillose flecks from the
outer veil, the margin appendiculate with patches of the inner veil, glabrescent,
when moist "warm sepia" to "bister" (dark dingy brown to reddish brown),
hygrophanous and fading to "ochraceous-buff" (yellowish), at maturity closely
striatulate before fading, opaque when faded. Context very thin and fragile, odor
none, taste not recorded.
Lamellae adnate but soon seceding, moderately broad, subdistant, tapered
evenly toward the pileus margin, edges even and whitish to concolorous.
Stipe 6-8 cm long, (2-)3-5 mm thick, equal, hollow, fragile, white, covered
to near apex with patches of white fibrils, soon glabrescent.