782 THE AGARICACEAE OF MICHIGAN 



(c) Pileus striate (moist), hygrophanous; stem fragile. M. capil- 



laripes Pk. 

 (cc) Pileus not striate nor hygrophanous; stem toughish. 843. M. 



clenticulata Pk. 



(E) INSTITITIAE 



(a) On the bark of living tree trunks; common on shade trees; gills 



broad. 844. M. corticola Fr. 

 (aa) On fallen leaves in woods; stem hairy; gills narrow. 845. M. 



setosa Fr. 



(F) ADONIDAE 



(a) Pileus 2-5 cm. broad, thick, rose color to pale lilac; odor of radish. 



846. M. pur a Fr. 

 (aa) Pileus usually less than 2 cm. broad. Pileus, stem and gills 

 entirely white; small; gills rather broad, subdistant. 

 (b) Stem at first minutely-pulverulent; pileus papillate on disk. 



847. M. minutula Pk. 

 (bb) Stem glabrous, pellucid; pileus not papillate. 848. M. immacu- 

 lata Pk. 



(G) RIGIPEDES 



(a) Pileus bluish at first, 5-12 mm. broad; stem grayish-brown. . 855. 



M. cyaneobasis Pk. 

 (aa) Pileus not bluish, larger, 1-4 cm. broad, 

 (b) Gills brown from the brown cystidia; stem horny, shining, dark 



brown. (See 46. Marasmius eohaerens). 

 (bb) Gills not deep brown, 

 (c) Gills assuming an incarnate tinge in age; stems rufous-brown 

 downwards; odor and cystidia lacking. 849. M. galericulata 

 Fr. 

 (cc) Gills usually cinerascent in age. 



(d) Pileus some shade of gray or almost white, 

 (e) Odor nitrous; cystidia abundant on sides of gills; pileus 

 white to pearl-gray. 853. M. polygramma Fr. var. albida 

 Kauff. 

 tee) Odor not nitrous. 



(f) Pileus 1-3 cm. broad, dark ashy to pearl-gray; cystidia 

 few; gills not with decurrent tooth. 852. M. para- 

 bolica Fr. 

 (ff) Pileus 0.5-2 cm. broad, dark ashy;gills uncinate; spores 

 tubercular-rough. 854. M. lasiosperma Bres. 

 (dd) Pileus dark fuscous or dark brown, 2-4 cm. 



(e) Gills subdistant,, with cystidia, rather broad but narrowly 



adnexed. 851. M. excisa Fr. 

 (ee) Gills crowded, narrow; whole plant brownish-fucescent, 

 dark. 850. M. inclinata Fr. var. 



(H) FRAGILIPEDES 



(a) Odor alkaline or nitrous in fresh plants. 



(b) Stem lubricous; spores symmetrically elliptical; pileus grayish- 

 brown to grayish-umber (moist). 856. M. alcalina Fr. 

 (bb) Stem not lubricous; usually gregarious, not very caespitose. 

 (c) Pileus glaucous-pruinose when dry, soon grayish-white; gills 



not decurrent by tooth. 859. M. leptocephala Fr. 

 (cc) Pileus not glaucous, 

 (d) Gills adnate with tooth; odor strong; pileus dark fuscous- 

 gray (moist). 857. M. ammoniaca Fr. 



