The North American species of Psathyrella.

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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN

[VOL. 24

Material examined. Alabama: Burke BA, BCG, BCa, BG, BI. Illinois:
Harper 5-2-98. Michigan: Ammirati 1492, 2453, 2566; Bartelli 660; Boynton
6-25-49; Kanouse and McCrea 5-20-42, 5-23-42#2; Potter 4900, 5054, 8648,
8672, 8689, 8862, 9056, 9428, 9705, 11572; Shaffer 1383; Smith 1399, 5008, 6282,
6285 (Type), 6319, 10929, 10974, 15032, 18945, 18948, 20302, 20358, 20359, 20542,
20606, 20607, 20615, 20619, 20680, 20827, 20840, 20842, 20853, 20856, 20861,
20865, 20866, 20904, 20907, 20908, 20959, 21010, 21015, 21087, 21092, 21093,
21099, 21116, 21117, 21120, 21125, 21129, 21130, 21131, 21234, 21287, 21288,
21292, 21377, 21434, 21490, 21555, 21558, 21686, 25395, 25484, 25531, 25634,
25635, 25996, 32123, 32179, 32228, 32247, 32310, 32317, 32320, 32900, 33605,
33606, 33607, 33608, 33721, 33729, 33730, 33737, 33746, 36311, 39187 (f. microspora), 41423, 41918, 44062, 50674, 51139, 57131, 57135, 57153, 62206, 63460,
63536, 63546, 64552, 64580, 64797, 66655, 66688, 66904, 71530, 77517, 77533,
77567, 6-4-40, 6-22-69; N. J. Smith 1007, 1865; Thiers 2751, 2863, 2920, 4002;
1948 Douglas Lake Foray. Oregon: Sipe 507. Tennessee: Boarts 16361.
33. Psathyrella subpurpurea A. H. Smith, sp. nov.
Pileus 2-4 cm latus, demum late convexus, purpureo-griseus, glaber; lamellae
confertae, angustae, demum sublatae, secedentes, demum sordide vinaceo-brunneae; stipes 5-9 cm longus, 2.5-5 mm crassus, glaber; annulus striatus, membranaceus, saepe evanescens; sporae 7-9 x 4-4.5 t; pleurocystidia 46-70 (-80) x
9-16 /, ad apicerum acuta vel subacuta; fibulae adsunt. Typus. Smith 55579
(MICH); legit prope Grants Pass, Oregon.
Pileus 2-4 cm broad, convex with a straight margin, in age broadly convex,
glabrous, moist, hygrophanous, dark purple-drab ("dark purple-drab") to more
vinaceous ("dark vinaceous-drab") with a grayish-hoary overcast but no veil
fibrils present, fading to a dingy vinaceous-drab but in drying becoming dark
purple-drab again. Context thin and very fragile, odor not distinctive.
Lamellae close, narrow to moderately broad, equal, seceding, dingy vinaceous
brown becoming dark vinaceous and drying "Natal brown," edges crenulate.
Stipe 5-9 cm long, 2.5-5 mm thick, equal or nearly so, whitish but generally
dingy in age, with a median flaring annulus striate on the upper side and fringed
on the margin, annulus often evanescent, slightly pruinose near the apex.
Spores 7-9 x 4-4.5 I,, smooth, apical pore distinct and apex somewhat truncate,
shape in face view ovate to elliptic, in profile obscurely inequilateral to subelliptic, rarely obscurely bean-shaped to drop-shaped, color in KOH ochraceoustawny to dull tawny, slowly becoming grayer, in Melzer's pale tawny, wall about
0.3 M thick.
Basidia 4-spored, 8-9 u broad at apex. Pleurocystidia abundant, 46-70 (-80) x
9-16 fJ, fusoid-ventricose with a long, tapered neck to an acute to obtuse apex;
wall smooth, thin and hyaline, or refractive and 0.3-0.4 fu thick (~ ) in some; cell
content not distinctive. Cheilocystidia smaller than the pleurocystidia and more
obtuse at apex. Cuticle of pileus a layer 2-4 cells deep, walls yellowish to hyaline,
smooth, cell content not distinctive. Hyphae of the subcuticular zone dull rusty
brown, fading, wall mostly somewhat incrusted. Clamp connections present.
Type locality. Sleepy Hollow, near Grants Pass, Oregon.
Habit and habitat. On conifer debris and duff, late fall, rare.
Distribution. California, Oregon.
Observations. The colors remind one of those as described for P. bipellis but
the latter does not have an annulus. Psathyrella longistriata is close, but in that