62 TWEN1Y-FOURTH REPORI ON THE STATE MUuSEUM. 
lamellee narrow, close, white, free; stem equal, firm, hollow, 
tomentose-fibrillose, brownish-tawny ; spores subelliptical, =3,,’ 
long. 
Plant czespitose, 1.5—2’ high, pileus 6-12” broad, stem 1” thick. 
Base of an elm tree. Albany. August. 
Allied to A. stipitarius, but a much larger plant with a differ- 
ent mode of growth. Under a lens the pileus is seen to be clothed 
with rather coarse, densely matted, subfasciculate, prostrate, tawny 
hairs. In the dried specimens the darker zones are less clear, and 
the pileus has become concentrically sulcate. A minute umbo or 
papilla is seen in the umbilicus in some specimens. 
Agaricus cuusiuis L7. 
Burnt ground in woods. Greig. September. 
Agaricus (CoLLyBIA) SPINULIFER 72. sp. 
Pileus fleshy, thin, convex, smooth, hygrophanous, alutaceous 
tinged with pink and slightly striatulate on the margin when 
moist, paler when dry ; lamelle narrow, close, rounded behind and 
free, pale cinnamon colored ; stem slender, tough, smooth, shining, 
hollow, reddish-brown, paler above, with a whitish mycelium at 
the base ; spores subelliptical, 7,5,’ long. 
Plant czspitose, 2’-3’ high, pileus 1’—1.5’ broad, stem 1” thick. 
Old logs and ground among leaves in woods. Greig. Septem- 
ber. (Plate 1, figs. 4~9.) 
The lamellz are clothed with minute spines or sete, of a dull 
cinnamon color, about 7,3, long, thickest near the base and 
gradually tapering to the point. These give to the lamelle their 
peculiar hue. In young plants the stem is whitish nearly to the 
base. 
Agaricus (CoLLYBIA) SIMILLIMUS 7. sp. 
Size and habit exactly as in the preceding species for which it is 
liable to be mistaken. The pileus becomes lighter colored (almost 
white) in drying, the lamelle are white, attached to the stem and 
destitute of the spine-like processes which form such a remarkable 
feature in its near ally, and the stem is of a uniform reddish- 
brown color. 
Greig. September. 
Acaricus Lraranus Berk. 
Decaying beech logs and branches in woods. Buffalo. Clinton. 
Sandlake, Helderberg and Adirondack mountains. July, Septem- 
ber. 
An extremely beautiful plant when young and fresh, but it loses 
its color in drying. It grows in dense tufts, and when young, 
