The North American species of Psathyrella.

1972]

PSATHYRELLA

131

tapering slightly into a short neck, with the apex broadly rounded to obtuse, some
broadly elliptic-pedicellate in optical section, all smooth, hyaline and thin-walled,
cell content not distinctive. Cheilocystidia numerous, cylindrical narrowly clavate, subventricose and subcapitate, straight or flexuous, also similar to pleurocystidia in part, all thin-walled and hyaline, 50-80 x 10-15 tx.
Pileus cuticle a layer of vesiculose cells several deep, their walls thin, smooth
and hyaline, the cell content not distinctive.
Type locality. Ithaca, New York.
Habit and habitat. Gregarious on very rotten wood in woods.
Distribution. New York, type studied.
Observations. The description of the cheilocystidia is taken in part from the
original account. In my examination of the type I did not see the greatly
elongated cells, but I see no reason to doubt Atkinson's data. The species is
amply distinguished by its copious outer veil, the somewhat bluntly fusoid spores
in face view, and the pale pink tinge in the stipe.
86. Psathyrella pannucioides A. H. Smith, sp. nov.
Pileus 2-4 cm latus, conicus demum late conicus vel convexus, fibrillososquamulosus, glabrescens ad marginem appendiculatus, laete cinnamomeus cum
"FeSO4" leviter olivaceus; lamellae confertae, adnatae, laete, cinnamomeae
demum purpureo-brunneae; stipes 3-5 cm longus, 2-3.5 mm crassus; albidus
vel pallidus, deorsum squarrose squamulosus; sporae 7-9 x 4-4.5 /; pleurocystidia
38-50x13-15 f late rotundata; fibulae adsunt. Typus. Smith 66625 (MICH);
Huron Mountains prope Big Bay, Michigan.
Pileus 2-4 cm broad, obtusely conic expanding to broadly conic to convex, at
first covered with white recurved fibrillose squamules, margin appendiculate with
veil remnants, color when fresh and moist a rich watery cinnamon, hygrophanous
and fading to cinnamon-buff. Context thin, cinnamon moist, paler faded, odor
and taste not distinctive, with FeSO4 slightly olivaceous.
Lamellae close, moderately broad, adnate, pale cinnamon becoming rich
cinnamon and finally clouded purple-brown from spores, edges pallid.
Stipe 3-5 cm long, 2-3.5 mm thick, equal, fragile, whitish over all beneath veil
remnants and merely pallid in age, squarrose-squamulose below the veil line from
the remains of the veil.
Spores 7-9 x 4-4.5 /, smooth, apical pore distinct and apex truncate, shape in
face view elliptic, varying to obscurely ovate, in profile somewhat inequilateral
varying to obscurely so, color in KOH dark cocoa-brown becoming distinctly
reddish violet-brown, in Melzer's strongly reddish tawny, wall about 0.3 / thick.
Basidia 4-spored, clavate, hyaline (17-)20-30x8-9 /u. Pleurocystidia scattered, 38-50x 13-15 /A, utriform to fusoid-ventricose with broadly rounded apex,
wall thin, smooth and hyaline (rarely with granular debris around the apex), cell
content not distinctive. Cheilocystidia 30-42 x 6-9 /, subcylindric-capitate, varying to utriform (like the pleurocystidia). Pileus trama vinaceous-cinnamon in
KOH, with pigmented wall thickenings near the septa frequently present. Cuticle
of pileus of inflated cells 2-3 deep, wall thin, hyaline to weakly cinnamon and
smooth; content of cell not distinctive. Clamp connections present.
Type locality. Lake Ann, Huron Mountain Club, Big Bay, Michigan.
Habit and habitat. Scattered on hardwood sticks, June.
Distribution. Marquette County, Michigan.
Observations. This is a rather distinctive species because of the clear