[Vor. 3 
196 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
unequal, 4-7 mm. broad, the edge whitish; stem central, terete, 
equal or slightly tapering downward, hollow, twisted, pruin- 
ose-scabrous at the apex, somewhat shining, pale brown, car- 
tilaginous and brittle, 4-8 em. long, 4-8 mm. thick; veil not 
apparent; spores elliptic or broadly elliptic, nearly black, 
8-10Х5.5-6.5и; cystidia none. 
Cespitose or gregarious on earth in flower beds in the Mis- 
souri Botanical Garden, May 31, 1915; also at the same place, 
June 17, 1915. 
Type collection in Herb. Overholts No. 2795, and specimens 
from this collection are deposited in the herbaria of the 
New York Botanical Garden and the Missouri Botanical Gar- 
en. 
The species is in every way distinct from P. retirugis Fries 
and P. alveolatus Peck. The pileus when very young is pitted 
only in the center, but mature plants are pitted all over and 
at times appear reticulate. When dried the pileus is smooth 
or nearly so. 
Panaeolus rufus Overholts, n. sp. Plate 6, fig. 2. 
Pileus convex to nearly plane, sometimes broadly umbonate, 
2-5 em. broad, varying in color from tan to light brown or 
chestnut, darkest at the center, dry, glabrous, often becoming 
cracked and areolate except at the center; margin even, ex- 
tending slightly beyond the lamellae; flesh thin, white; odor 
none; taste farinaceous; gills adnate or adnexed, medium 
close or slightly distant, spotted, becoming blackish brown, 
whitish on the edge; stem central, terete, pruinose, striate, 
light-colored above, becoming dark reddish brown below, white 
tomentose at the base, firm, cartilaginous, hollow, 5-10 em. long, 
2.5-6 mm. thick; veil not apparent; spores elliptic or broadly 
elliptic, almost black in mass, 12-13,5Х7.5-9и; cystidia none. 
Gregarious on a compost heap in the Missouri Botanical 
Garden, June 1, 1915. 
Type collection in Herb. Overholts No. 2796, and вресі- 
mens from this collection are deposited in the herbaria of 
the Missouri Botanieal Garden and the New York Botanical 
Garden. 
