The North American species of Psathyrella.

46

MEMOIRS OF THE NEW YORK BOTANICAL GARDEN

[VOL. 24

11. Psathyrella tigrina (Patouillard) A. H. Smith, comb. nov.
Psathyra tigrina Patouillard, Bull. Soc. Mycol. Fr. 15: 197. 1899.
Illust. Text Fig. 22.
Pileus at first ovoid, white, marked with appressed brownish black scales giving it a streaked appearance, the scales formed by the remains of the universal
veil, finally becoming campanulate with the margin recurved, smooth or slightly
striatulate, bibulous, finally somewhat deliquescent and entirely brownish purple.
Lamellae linear, white then purplish.
Stipe 3-5 cm long, cylindric, slender, fragile, white; annulus none.
Spores 6-8.5 x 4-5 x5-6.6 u, smooth, pore apical and distinct, shape in face
view broadly ovate to almost subangular or merely more ventricose on one side
than the other, in profile view subelliptic to slightly inequilateral, in KOH dull
cocoa-color becoming chocolate-gray.
In the portion of the type studied all tissues revived so poorly that reliable
data on them could not be obtained.
Type locality. Basse-Terre, Guadeloupe.
Habit and habitat. Gregarious on decaying sticks.
Distribution. Known only from the type locality.
Observations. This species could be a Coprinus, but in view of the features as
described above it is included here (type studied).
12. Psathyrella subamara A. H. Smith, sp. nov.
Pileus 1-3.5 cm latus, obtuse conicus demum late campanulatus, spadiceofibrillosus; sapor subamarus; lamellae confertae, secedentes, pallide brunneae
demum subfuscae; stipes 2-3 (-4) cm longus, 2.5-4 mm crassus, deorsum spadiceofibrillosus; sporae 7-9x4-4.5 u, ad basem truncatae; pleurocystidia 32-44x
9-14 g/, ad apicerum late rotundata; caulocystidia clavata; hyphae epicuticularum
intus fumoso-ochraceae; fibulae adsunt. Typus. Smith 78178 (MICH); legit
Roy Watling, prope Roxbury Creek, Chippewa County, Michigan.
Illust. P1. 9, fig. b; Text. Figs. 23-25
Pileus 1-3.5 cm broad, obtusely conic becoming broadly campanulate, surface
when young covered by a mat of veil fibrils colored dark yellow-brown ("Dresden
brown"), the layer becoming stretched by expansion of the pileus and breaking
into appressed squamules and finally almost glabrous except for the disc, ground
color dingy pallid over the margin and near wood-brown over the disc beneath
the squamules, margin appendiculate at first from the pallid remnants of the veil.
Context pallid fragile, taste bitterish, odor none, with FeSO4 no color change.
Lamellae pallid brownish, becoming avellaneous then wood brown and developing a vinaceous-fawn (reddish tone), brownish vinaceous as dried, close, very thin,
adnate, seceding, edges even.
Stipe 2-3 (-4) cm long, 2.5-4 mm thick, equal tubular, white throughout but
lower part with dark yellow-brown patches of veil tissue in part obscuring the
ground color, usually not becoming entirely glabrous.
Spores 7-9 x 4-4.5 f, smooth, with an inconspicuous hyaline apical spot as a
pore, shape in face view ovate to wedge-shaped or corn-kernel-shaped (truncate
at apiculate end), in profile bean-shaped to obscurely inequilateral, color in KOH
soon dark chocolate-brown, in Melzer's reddish tawny, wall about 0.2 g thick.
Basidia 4-spored, 16-22x7-9 p, hyaline, clavate. Pleurocystidia abundant,
32-44 x 9-14 /, utriform or nearly so, smooth, wall hyaline and smooth, content