74 NEW YORK STATE MUSEUM 



Difformes 



Pileus fleshy on the (Hsk, thin on the margin, convex becoming 

 expanded or centrally depressed, often irregular; lamellae irregu- 

 larly adnate or decurrent ; stem externally subcartilaginous, fibrous, 

 commonly cespitose. 



This section is easily recognized by its cespitose habit and the 

 irregular character of the lamellae which are sometimes adnexed or 

 sinuate on one side of the stem and decurrent on the other. The 

 pileus is often irregular because of the crowded or tufted mode of 

 growth. It is also sometimes umbonate and sometimes obtuse even 

 in the same tuft. The stem too may be central or eccentric in the 

 same tuft or the plant may sometimes be solitary. 



KEY TO THE SPECIES 



Mature pileus some shade of brown i 



Mature pileus some shade of yellow 3 



Mature pileus white, whitish or grayish 4 



r Stem brown or brownish, colored like the pileus monadelpha 



I Stem white or whitish, paler than the pileus 2 



2 Stem stuffed, plant commonly gregarious fumosa 



2 Stem solid, plant commonly cespitose tumulosa 



3 Mature pileus pale ochraceous patuloides 



3 Mature pileus reddish yellow or saffron yellow illudens 



4 Pileus spotted, plant growing on wood marmorea 



4 Pileus not spotted, plant terrestrial 5 



5 Margin of moist pileus striatulate, curved upward in age revoluta 



5 Margin of moist pileus even, spreading in age 6 



6 Stem not more than 6 mm thick, pileus usually white. .. .multiformis 

 6 Stem more than 6 mm thick, pileus usually grayish multiceps 



Clitocybe monadelpha Morg. 



UNITED CLITOCYBE 

 N. Y. State Mus. Mem. 4, p.140, pl.46, fig.7-12 



Pileus fleshy, convex sometimes becoming centrally depressed, 

 squamulose in the center, pale brown, reddish brown or honey color ; 

 lamellae moderately close, distinctly decurrent, pallid or pale flesh 

 color; stem long, flexuous, fibrous, solid, often becoming hollow 

 with age and twisted and tapering at the base, brown, pale brown or 

 tinged with flesh color; spores broadly ellipsoid or slightly irregular, 

 7-9 X 5-6 fi. 



Pileus 2.5-7 cm broad ; stem 6-10 cm long, 4-6 mm thick. 



Cespitose. Woods and open places. Near New York City, also 

 Albany and Madison counties. September. Occasional. 



