M> THE CHICAGO ACADEMY OF SCIENCES 



CREPIDOTUS. 



. Stature various, irregular without a manifest veil; pileus 

 eccentric, lateral or resupinate: spores yellowish-brown. Growing 

 on wood, rarely on mosses; plants commonly with soft flesh. 



Plant with a distinct stem C. tiliophilus. 



Plant sessile or nearly so 1 



1. Pileus glabrous or only slightly villous 



at the base 2 



1 . Pileus not glabrous 3 



2. Lamellae very narrow, decurrent C. applanatus. 



2. Lamellae broader, rounded behind C. malach 



2. Lamellae decurrent to the base ('. mollis. 



3. Pileus white with a white villosity C. herbarum. 



3. Pileus squamose with a tawny to- 



inentum C. fulvotomentosus 



3. Pileus reddish-yellow with a yellowish 



tomentum... . .C. dorsalis. 



Crepidotus tiliophilus Pk. 



Pileus moderately thin, convex, minutely pulverulent, hy- 

 grophanous. watery-brown and striatulate on the margin when 

 moist, dingy buff when dry. 



Lamellae rather broad, subdistant, rounded behind, adnexed, 

 colored like the pileus. becoming ferruginous-cinnamon. 



Stem solid, often curved, pruinose. with a white pubescence at 

 the bas* . 



Pileus 12 to 24 mm. broad: stem 4 to s mm. long. 2 mm. 

 thick; spores subelliptical. brownish-ferruginous, 6 to 7..") x 4 to 5 /a. 



On bark of living Crataegus, open woods. Glen Ellyn. August. 

 Spores somewhat irregular in shape, 6 to $ /*.; otherwise our 

 specimens agree with the description. The plant from which 

 Prof. Peck's description was written grew upon dead trunks and 

 branches of i ". 



Crepidotus applanatus Fr. 



Pileus very thin, variable in shape, suborbicular, reniform. 

 cuneiform or spathulate. plane or convex, sometimes slightly 

 depressed behind, sessile or prolonged behind into a short com- 

 pressed white-tomentose stem-like base, glabrous, hygrophanous, 

 watery-white and striatulate on the margin when moist, white 

 when dry. 



Lamellae very narrow, linear, crowded, decurrent. white, 

 becoming cinnamon. 



Pileus 12 to 24 mm. Ion-. 8 t<> 20 mm. broad: spores globosi . 

 5 to 6 fj-. 



On stumps, woods, (den Ellyn. July. 

 Crepidotus malachius B. & C. 



Gregarious but scattered, horizontal: pileus smooth, white, 

 cuneiform, subflabellate; flesh rather thick behind, very thin in 

 front. 



