34 NEW YORK STATE MUSEUM 



spores white, smooth (angular in M. n i g r i p e s ) (Schw.) Fr. 

 elliptic, rarely globose when mature, usually more or less obliquely 

 apiculate, maturing slowly and unequally so that it is often difficult 

 to find mature spores in dried plants. The plants usually grow upon 

 vegetable matter, grass, leaves, twigs, bark, wood etc., but very 

 seldom upon soil. 



Key to Species 



I Pileus fleshy or subfleshy, i cm or more broad; stipe more or less tomen- 

 tose or hairy, at least below ; lamellae free or adnexed. Some large plants 

 with nearly smooth stipe are placed in this section. 



Pileus white 34 M . p h y 1 1 o p h i 1 u s 



Pileus not white, sometimes pallid in dried 

 plants 

 Plants large, pileus 2 cm or more broad 

 Lamellae crowded 



Plants with odor and taste strong of 

 onions 



Spores small i M. polyphyllus 



Spores 12-14 I'- long 2M.prasiosmus 



Plants with neither odor nor taste of 

 onions 



Stipe smooth above 6M.fasciatus 



Stipe more or less tomentose through- 

 out 

 Lamellae free, remote; stipe en- 

 larged at the apex 3M,confluens 



Lamellae adnexed ; stipe not en- 

 larged at the apex 

 Stipe long and twisted ; pileus 



usually pallescent 4M. archiropus 



Stipe not long and twisted; pileus 



brown 5 M. multifolius 



Lamellae not crowded 



Taste strong and acrid ; lamellae usually 

 becoming reddish 



Pileus purple 9M. iocephalus 



Pileus not purple 



Lamellae broad 7 M. peronatus 



Lamellae narrow 



Stipe long 8 M. subnudus 



Stipe short 10 M. rubrophyllus 



Taste neither strong nor acrid 



Lamellae free, usually growing in 



lawns or grassy places 11 M. caryophylleus 



Lamellae adnexed, growing in woods 



Stipe spongy, thickened at base T2M.spongiosus 



