North American species of Mycena.

EUMYCENA: TYPICAE

283

specimens which develop in the dense shade of the tree, but on a flat
needle carpet, have short stipes. Those growing beside them in the
moss develop long stipes, as do most other agarics, including Laccaria
laccata, which frequently grow in sphagnum.
Occasionally I have observed the gills separating from the stipe
and forming a collar around it, but this is apparently not a constant
enough character to be of any aid in recognizing the species. The
bloom, which often remains throughout the development of the pileus
during a' relatively dry season, is more pronounced than in most
Mycenae.
136. MYCENA FILOPES (Fr.) Quelet
Champ. Jura et Vosges, p. 106. 1872
Agaricus filopes Fries, Syst. Myc., 1: 142. 1821.
Mycena albogrisea Peck, Bull. New York State Mus., 116: 27. 1907.
Prunulus albogriseus Murrill, North Am. Flora, 9: 327. 1916.
Illustrations:
Plate 54 A; Text fig. 33, nos. 11-12 (p. 275).
Beardslee and Coker, Journ. Elisha Mitchell Sci. Soc., 40, pl. 23 (lower
figs.); pi. 24.
House, Bull. New York State Mus., 219-220, fig. 1, p. 234.
Konrad et Maublanc, Icon. Sel. Fung., 3, pl. 233, II.
Lange, Flora Agar. Dan., 2, pl. 57 G (small).
Ricken, Die Blatterpilze, 2, pl. 110, fig. 6 (as M. vitilis).
Pileus (5) 10-20 (25) mm. broad, cylindric to ovoid when young,
becoming obtusely conic, campanulate, or with a flaring margin and
a long obtuse umbo, surface at first hoary from a faint bloom, soon
polished and moist, glabrous, the umbo "fuscous" (dark grayish
brown) at first, fading to "benzo brown" (drab with a tinge of reddish), margin watery gray or paler, gradually fading over all to pallid
gray with, pale brownish-gray disc, translucent-striate when moist,
sometimes becoming sulcate in age, margin entire; flesh thin, rather
fragile, no odor, taste mild, no color changes noted; lamellae close to
scarcely subdistant, narrow, adnate, pallid brownish; stipe (5) 8-12
(15) cm. long, 1-2 mm. thick, equal, tubular, very brittle, covered
with a hoary bloom at first, polished and translucent in age, base
white-strigose and sometimes slightly rooting, the apex often bluish
black at first, the remainder fuscous, fading to pallid gray or pallid
watery white above, in age dark brownish drab toward the base.
Spores 7-9 X 4-5 A, smooth, narrowly ellipsoid to ovoid, amyloid;