North American species of Mycena.

EUMYCENA: LACTIPEDES

133

7. Gill edges colored reddish or reddish brown...................... 8
7. Gill edges not differently colored................ 58. M. haematopus
8. Stipe glabrous to densely pruinose but not fibrillose at apex........ 9
8. Stipe surface fibrillose to slightly scurfy because of dark reddishbrown fibrils.............................. 60. M. Atkinsoniana
9. Pileus with crenate margin........ 59. M. haematopus var. marginata
9. Margin of pileus not crenate................................... 10
10. Spores 7-8.5 u long; pleurocystidia absent... 61. M. subsanguinolenta
10. Spores 8-10 (11) ju long; pleurocystidia present..... M. sanguinolenta
52. MYCENA GALOPUS (Fr.) Quelet
Champ. Jura et Vosges, p. 107. 1872
Agaricus galopus Fries, Syst. Myc., 1: 148. 1821.
Mycena lactescens Schroeter, Pilze Schles., p. 632. 1889.
Agaricus leucogalus Cooke, Grevillea, 12: 41. 1883.
Agaricus lacticularius Britz., Revision der Diagnosen zu dem von M. Britzelmayr aufgestellten Hymenomyceten-Arten. Bot. Centralbl., 63: 19.
1898.
Illustrations:
Plate 10 A; Text fig. 11, nos. 4, 6 (p. 129).
Beardslee and Coker, Journ. Elisha Mitchell Sci. Soc., p. 40, pl. 9, lower
fig.
Bresadola, Icon. Mycol., 5, pl. 248, fig. 1.
Konrad et Maublanc, Icon. Sel. Fung., 3, pl. 225.
Lange, Flora Agar. Dan., 2, pl. 50 E and pl. 51, figs. G, G1.
Ricken, Die Blitterpilze, 2, pl. 109, fig. 11.
Pileus 5-25 mm. broad, ovoid when young, becoming conic or
conic-campanulate, in age often with a recurved margin and a prominent umbo, surface with a hoary sheen at first, soon becoming naked
and glabrous, margin entire and appressed against the stipe at first,
translucent-striate when moist, somewhat sulcate when faded, color
"fuscous black" over all except the whitish margin, fading to pale
gray, the umbo remaining blackish or becoming dark gray, sometimes
very pale ashy gray over all when moist, opaque and cinereous after
losing moisture; flesh thin, soft, fragile, odor and taste not distinctive;
lamellae subdistant, narrow, ascending-adnate, whitish to gray,
usually darker in age, edges pallid or grayish; stipe 4-8 (12) cm. long,
1-2 mm. thick, equal, strict or flexuous, glabrous, fragile, dark blackish brown below or merely dark cinereous, apex pallid, base whitestrigose, when broken exuding a white milklike juice.