34 THE CHICAGO ACADEMY OF SCIENCES 



CLITOCYBE. 



Universal veil, when present, conspicuous on the pileus like 

 frost or silky dew, but commonly obsolete; stem with a spongy 

 stuffing, apt to become hollow, somewhat elastic; margin of the 

 pileus involute; hymenophore continuous, owing to the apex of 

 the stem being dilated; lamellae acute at the edges, attenuated 

 behind, adnate or decurrent. 



Growing on the ground, fleshy but comparatively tough. 

 Spores w r hite. 



Plant not hygrophanous 1 



Plant hygrophanous 6 



1. Pileus disk-shaped, regular 2 



2. Pileus white, shining w r hen dry C. cerussaia. 



2. Pileus whitish or pale-tan C. piceina. 



2. Pileus pale-yellowish with a reddish 



tinge C. socialis. 



2. Pileus with a greenish tinge, fragrant . C. odora. 



3. Pileus irregularly shaped 4 



4. Pileus whitish, grayish or yellowish- 

 gray, stem whitish C. multiceps. 



4. Whole plant orange-yellow C. illudens. 



4. Whole plant opaque-whitish C. monstrosa. 



5. Pileus at length funnel-shaped C. infundibuliformis. 



6. Whole plant reddish-flesh-color when 



moist C. laccata. 



6. Whole plant dark-purple when moist. C. amethystina. 

 6. Pileus pale-alutaceous, lamellae 



purple C. ochropurpurea. 



Clitocybe cerussata Fr. 



Pileus fleshy, convex, then nearly plane, obtuse, even, 

 minutely floccose then almost glabrous, white. 



Lamellae adnate, then decurrent, very crowded, thin, white. 

 Stem smooth, tough, elastic, spongy, solid, white. 



Among dead leaves in woods, Glen Ellyn, October. Wholly 

 shining white. Spores sphaeroid, 4 to 5 p. 

 Clitocybe piceina Peck, Bull. Torr. Cl. 31; 178. (Plate II, Fig. 2) 



Pileus fleshy, firm, convex or nearly plane, dry, white or 

 whitish tinged with gray when young; flesh compact, white, 

 taste pungent, odor strong, disagreeable. 



Lamellae close, decurrent, or sometimes strongly decurrent in 

 lines running down the stem, creamy-white. 



Stem equal or nearly so, firm, stout, solid, subfibrous, com- 

 monly striate at the top, with raised longitudinal lines. Spores 

 globose, 5 to 6 /A. 



^ Pileus 6 to 10 cm. broad; stem 5 to 7 cm. long, 12 to 18 mm. 

 thick. 



In the dried specimens the pileus sometimes assumes a yellow- 

 ish tint. The species is closely allied to C. cerussata and C. 

 albissima. From the former it may be separated by its larger 



