The North American species of Psathyrella.

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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN

[VOL. 24

Stipe cylindric, 3 cm long, 1-2 mm thick, white, shining, glabrous, hollow.
Spores 7-8.5(-9) X4-5 a, smooth, with an obscure apical hyaline pore and
spore apex not obviously truncate, shape in face view oblong to somewhat ovate
(many elliptic), in profile obscurely inequilateral to subelliptic, color in KOH
ochraceous-avellaneous when first revived, becoming avellaneous, in Melzer's
pale tawny, wall about 0.3. thick.
Basidia 4-spored. Pleurocystidia not found. Cheilocystidia saccate to clavate
or broadly ventricose, 20-30 x 9-13 a, hyaline, thin-walled, readily collapsing.
Cuticle of pileus of inflated cells. Hyphae of context not distinctively colored
as revived in KOH (but poorly revived). Clamps present.
Type locality. Santiago de las Vegas, Cuba.
Habit and habitat. Along paths.
Distribution. Known only from the type locality.
Observations. The subventricose gills are unusual in this group. It appears
to be close to P. castaneidisca.
252. Psathyrella tennis (Murrill) A. H. Smith, comb. nov.
Drosophila tenuis Murrill, Mycologia 10: 65. 1918.
Illust. Text Fig. 547.
Pileus 3-4 cm broad, convex, surface hygrophanous, subglabrous, brownish,
paler when dry, faintly striate. Context very thin, watery, fragile.
Lamellae adnexed or adnate, subcrowded, rather broad, reddish brown when
mature.
Stipe 7-8 cm long, 3 mm thick, cylindric, glabrous, shining white, fragile,
hollow; veil not evident when collected.
Spores 7-9x4-5 p, smooth, apical hyaline pore distinct but small and apex
not distinctly truncate, shape in face view ovate to elliptic, in profile obscurely
inequilateral to subelliptic, color in KOH dull cocoa-color but soon pale bister and
in 15 minutes yellowish gray, "decidedly purplish brown in water mounts of
fresh material," in Melzer's ochraceous-tawny or slightly more reddish cinnamon,
wall about 0.2 pu thick.
Basidia 4-spored. Brachybasidioles possibly present. Pleurocystidia not seen.
Cheilocystidia scattered, 28-36 10-12 pu, fusoid-ventricose to subcylindric with
broadly rounded apex, hyaline, thin-walled, smooth and readily collapsing.
Caulocystidia present and similar to cheilocystidia or apex merely obtuse. Pileus
having a cuticle of vesiculose cells (no other details obtainable). Clamp connections present.
Type locality. El Yunque, Cuba.
Habit and habitat. Subcespitose on ground in woods.
Distribution. Known only from the type locality.
Observations. The above account is based on the type and the original
description. The color of the spores revived in KOH appears to distinguish this
species from P. murrillii, though the generalized original descriptions do not
leave much to choose from by way of distinguishing features.
253. Psathyrella coprinoceps (Berkeley & Curtis) Dennis, Fungi Venez. 466. 1970.
Agaricus coprinoceps Berkeley & Curtis, Jour. Linn. Soc. 10: 290. 1868.
Naucoria copriniceps (Berk. & Curt.) Saccardo, Sylloge Fung. 5: 835. 1887.
Atylospora coprinoceps (Berk. & Curt.) Murrill, Mycologia 10: 21. 1918.
Pileus about 10-20 mm broad, convex becoming plane, the margin finally
revolute, glabrous, white. Context very thin and fragile.