NATURAL HISTORY SURVEY 43 



small, acute umbo. The lamellae although united to each other 

 behind are adnate to the stem, and not to a separate collar as in 

 Marasmius rotula. Cespitose, several individuals united by 

 proliferous stems and a whitish tomentum. I do not find any 

 spore measurements of this species. In our plant they are sub- 

 globose, 6 to 7 //.. 



Mycena galericulata Scop. (Plate IV). 



Pileus obtusely conical or campanulate, sometimes umbonate, 

 long-striate, variable in color, but some shade of brown or ciner- 

 eous. 



Lamellae not crowded, uncinate, decurrent-toothed, abruptly 

 pointed at the outer extremity, venose-connected, distinct at the 

 stem, white or flesh-colored. 



Stem firm, smooth, hollow, with white filaments at the base. 



Pileus 1 to 3.5 cm. in diameter, stem 6 to 12 cm. long. 



Common on stumps, decayed logs, sticks, etc. Very variable 

 in size and color. Often densely cespitose. Upon the same log 

 may be found plants varying from 6 mm. to 6 cm. in diameter, 

 although the latter size is unusual. 



Mycena alcalina Fr. 



Pileus campanulate, obtuse, margin at length spreading or 

 sometimes upturned, deeply striate when moist, shining when 

 dry, color various, pallid or with a tinge of pale yellowish-green, 

 the disk darker; odor strong and nitrous. 



Lamellae adnate, narrowed behind, rather distant, whitish 

 then glaucous or grayish. 



Stem hollow, equal, pale, sometimes yellow, shining, slightly 

 viscid, the base downy. 



Pileus 1.5 to 9 cm. broad; stem 5 to 7.5 cm. long, 2 mm. thick. 

 Solitary or densely cespitose. 



On dead stump, River Forest. June. Pileus whitish-fuligi- 

 nous, the disk darker or blackish; odor strongly alkaline; spores 

 ellipsoid, 9 x 7 /x. 



Mycena tenuis Bolt. 



Pure white. Pileus very brittle, membranaceous, campanu- 

 late then convex, obtuse, striate more than half way to the disk, 

 margin crenulate. 



Lamellae adnate, ascending, distant, thin, watery. 



Stem straight, equal, glabrous, pellucid, minutely fistulose. 



Pileus about 12 mm. broad; stem 5 to 7.5 cm. long, less than 

 2 mm. thick. 



On dead leaves in moist woods, Glen Ellyn. September. 

 Pileus 8 to 12 mm. broad, hyaline when young, whitish -or fuscous- 

 white when older; hygrophanous. Stem smooth, pellucid, rigid- 

 fragile, white or pale watery-brown, sometimes crooked from 

 position. 



