The North American species of Psathyrella.

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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN

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rowed neck and subacute apex (or narrowly subcapitate), wall smooth, thin and
hyaline, cell content not distinctive in KOH or in Melzer's. Cheilocystidia
numerous, 25-46 x 6-12 (-15) f, cylindric to fusoid-ventricose, mostly more or
less fusoid but with flexuous hyaline sometimes somewhat refractive walls, content
not distinctive.
Gill trama pallid to dingy cinnamon in KOH, pigment in or on the wall. Pileus
trama rusty cinnamon revived in KOH, the hyphae of the subcuticular region
rather heavily incrusted with pigment or with pigmented wall thickenings. Cuticle
of pileus of inflated cells 1-2 deep, the walls yellowish to nearly hyaline in KOH
except for the bases or pedicels which are pale fulvous. Clamps present. No
distinctive reaction on any tissue when mounted in Melzer's.
Type locality. Pole Mountain, near Laramie, Wyoming.
Habit and habitat. Gregarious under aspen.
Distribution. Wyoming.
Observations. The flexuous caulocystidia, the heavy pigment incrustations on
the subcuticular hyphae of the pileus, the medium-large spores, and very poorly
developed veil appear distinctive.
284. Psathyrella duplicata A. H. Smith, sp. nov.
Pileus 1-3 cm latus, obtuse conicus vel campanulatus, glaber, fuscocinnamomeus vel fumoso-fulvus, ad marginem demum incarnatus; lamellae subdistantes, latae, (4 mm), "vinaceous buff" demum brunneo-violaceae, ad acierum
demum incarnatae; stipes 3-6(-8) cm longus, 1-1.5 mm crassus, glaber, pallidus;
sporae 10-12.5 x 5-6.5,; pleurocystidia 38-52 x 10-15,u; fusoide ventricosa,
acuta; fibulae adsunt. Typus. Smith 14162 (MICH); legit prope Lake Mills,
Washington (Olympic National Park).
Illust. P1. 79, fig. a; Text Figs. 608-610.
Pileus 1-3 cm broad, obtusely conic, becoming broadly campanulate or remaining unexpanded, margin appressed against the stipe at first, surface glabrous and
either even or rugulose, when moist "russet" to "Prout's brown" (dark rusty
brown), hygrophanous and fading in streaks, becoming "vinaceous-buff" (pale
pinkish tan) and in age tinged decidedly pinkish ("light russet-vinaceous"),
margin striatulate when moist. Context very thin and fragile, equal, concolorous
with surface, odor and taste mild.
Lamellae subdistant (17-20 reach the stipe), broad, about 4 mm, ascendingadnate, readily seceding, pale dull pinkish buff young ("vinaceous-buff"), sordid
purplish brown ("benzo brown") at maturity, edges whitish when young but often
pinkish in age.
Stipe 3-6 (-8) cm long, 1-1.5 mm thick, equal, tubular, strict and cartilaginous
(not fragile as in most species of Psathyrella), at times slightly undulating, base
attached to leaves by a few strigose hairs, glabrous otherwise and translucent
watery white; veil lacking or at times present (on small buttons) but rudimentary,
when present composed of a thin layer of white silky fibrils.
Spores 10-12.5 x 5-6.5 u, smooth, apical pore broad and apex distinctly
truncate, shape in face view elliptic to ovate, in profile somewhat to obscurely
inequilateral, more rarely subelliptic, color dark reddish brown in water mounts
of fresh material, medium to dark date brown revived in KOH, in Melzer's
reddish tawny, wall about 1 / thick.
Basidia 4-spored, clavate, 24-28x 10-13 p. Pleurocystidia abundant, fusoid
to fusoid-ventricose, apex acute to subacute, occasional cells clavate with 2-3