Peck : NEw SPECIES OF FUNGI 181 
wounded, often abruptly bulbous at the base, veil white, often ad- 
hering partly to the margin of the pileus and partly to the stem ; 
spores broadly elliptic, 7-8 » long, 5-6 u broad. 
ileus 2.5—6 cm. broad ; stem 5-10 cm. long, 6-10 mm thick. 
Manured ground in pasture. Denver, Colorado. June. E. B. 
Sterling. 
This differs from Agaricus compester rufescens in having its 
pileus minutely fibrillose, in its flesh becoming reddish where 
wounded, not bright red, and in its gills being at first reddish in- 
stead of white. It resembles Ag. maritimus in some respects but 
differs in its assumed color and in the absence of a seaside odor. 
Agaricus sphaerosporus 
Pileus fleshy, firm, broadly convex, sometimes slightly de- 
pressed in the center, glabrous, whitish, the cuticle sometimes ri- 
mose, and the incurved young margin occasionally wavy or irreg- 
ular when mature, flesh white, unchangeable ; lamellae thin, close, 
rounded behind, reaching the stem, but free from it, rosy red, be- 
coming blackish-brown ; stem nearly equal, thick, firm, solid, 
straight or curved, whitish, the thin white veil rupturing and ad- 
hering partly to the margin of the pileus and partly to the stem, 
forming a slight, fringed soon evanescent annulus ; spores globose 
or nearly so, 7.5-8 » long, 6—7.5 » broad. : 
Pileus 7-12 cm. broad; stem 3-10 cm. long, 2~3 cm. thick. 
Rich soil. Denver, Colorado. June. E. B. Sterling. This 
species closely resembles large forms of the common mushroom, 
from which it may be separated by its glabrous pileus, solid stem 
and nearly globose spores. Mr. Sterling has eaten it freely with- 
out harm and considers it a good edible mushroom. 
Agaricus cothurnatus 
Pileus fleshy, convex with involute margin, dry, glabrous or 
minutely pulverulent on the margin, chalky white, flesh white ; 
lamellae close, free, chocolate color becoming black ; stem nearly 
equal, white, with dense radicular fibers at the base, sheathed below 
by the white veil which forms a cup-like annulus with lacerated 
_ Margin above; spores subglobose, 8—9 » long, 7-8 y broad. 
Pileus 5~7.5 cm. broad ; stem 3-5 cm. long, 10-12 mm. thick. 
Rich soil along roadsides and paths. Denver, Colorado. 
March, FE. B. Sterling. 
The chocolate color of the young gills and the sheathed base 
of the stem are notable distinguishing characters of this species. 
