The North American species of Psathyrella.

1972]

PSATHYRELLA

337

ochraceous walls in KOH, cell content not distinctive. Hyphae of the context
when revived in KOH with incrusted hyphae, the pigment dingy clay color in
KOH (not fuscous!), slowly dissolving in KOH and sections soon nearly hyaline.
Clamp connections present.
Type locality. Douglas Lake, Cheboygan County, Michigan.
Habit and habitat. Gregarious on mud under pine trees, July.
Distribution. Known only from the type locality.
Observations. This species is at once distinguished from P. barlae by smaller
size, lack of a veil, and the merely obtuse cystidia. The KOH reaction on pilear
tissue distinguishes the two readily.
307. Psathyrella sumstinei A. H. Smith, sp. nov.
Pileus 1.5-3.5 cm latus, campanulatus vel convexus, glaber, cinnamomeobrunneae; lamellae confertae, angustae, rufo-cinnamomeae; stipes 7-14 cm longus,
1.5-3 mm crassus, glaber, ad basem strigosus, pallidus, in exsiccatis pallide alutaceus; sporae 13-15(-17-20) x6-7.5 u; pleurocystidia 52-74x10-15 [, fusoidea
ad apicerum acuta; caulocystidia 24-48(-60) x8-15,u, fusoide ventricosa, ad
apicerum rotundata vel obtusa. Typus. Sumstine 23 (MICH); legit prope Red
Raven, Allegheny County, Pennsylvania.
Illust. Text Figs. 657-661.
Pileus 1.5-3.5 cm broad, obtusely conic becoming campanulate or convex,
finally plane or nearly so, glabrous, more or less "cinnamon-brown" when moist,
margin striatulate, hygrophanous, fading to near "Sayal brown" (dull cinnamon)
or in old pilei avellaneous, retaining a pale dingy tan coloration as dried. Context
thin and very fragile, odor and taste not recorded. No veil present.
Lamellae close, adnate to adnexed, narrow, equal, dark reddish brown when
dried (near "warm sepia"), edges faintly whitish.
Stipe 7-14 cm long, 1.5-3 mm thick, equal, glabrous, white, hollow, fragile,
base somewhat strigose and rooting in the soil but not with a pseudorhiza, when
dried more or less evenly pinkish buff over all.
Spores 13-15 (17-20) x 6-7.5,u, smooth, apical pore present as a distinct
hyaline spot but apex only slightly truncate, shape in face view oblong to elliptic
to narrowly ovate, in profile obscurely inequilateral to subelliptic, color revived in
KOH dull cocoa-color darkening to a medium dark chocolate-color, in Melzer's
tawny reddish, wall about 1.2 i thick.
Basidia 25-30x 10-14 j, 2- and 4-spored, clavate to subcapitate, hyaline in
KOH. Pleurocystidia very abundant, 52-74x10-15 /u, with a distinct narrow
pedicel, ventricose above this and tapered evenly to a subacute apex or the apex
subcapitate, wall thin, smooth and hyaline, cell content not distinctive in KOH
or Melzer's. Cheilocystidia similar to pleurocystidia or the neck not so elongated,
some clavate hyaline cells 9-13 p broad also present. Caulocystidia numerous,
24-48(-60) x 8-15 t, fusoid-ventricose with rounded to obtuse apex, some with
hyaline refractive thickenings (or adhesions?) in the wall as revived in KOH.
Hyphae of the stipe cortex smooth.
Gill trama pale yellowish brown as revived in KOH, fading on standing. Pileus
trama a darker yellowish brown as revived in KOH, slowly becoming more dingy
cinnamon. Cuticle of pileus formed by a palisade of pear-shaped to clavate
hyaline cells.
Type locality. Red Raven, Allegheny County, Pennsylvania.
Habit and habitat. Cespitose to gregarious on soil.