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 dccurrent. 



Growing on the ground, fleshy but comparatively tough. 

 Spores white. 



Plant not hygrophanous 1 



Plant hygrophanous 6 



1. Pileus disk-shaped, regular 2 



2. Pileus white, shining when dry C. cerussaia. 



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



2. Pileus pale-yellowish with a reddish 



tinge C. so, -lulls. 



2. Pileus with a greenish tinge, fragrant . ( '. odora. 



3. Pileus irregularly shaped 4 



4. Pileus whitish, grayish or yellowish- 

 gray, stem whitish C. mvlticeps. 



1. Whole plant orange-yellow C. iUudens. 



4. "Whole plant opaque-whitish C. monstrosa. 



5. Pileus at length funnel-shaped C. infundibvliforn 



6. "Whole plant reddish-flesh-color when 



moist C. laccata. 



6. AYhole 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.. 

 3 m smooth, tough, elastic, spongy, solid, white. 



Among dead leaves in woods, (den Ellyn, October. Wholly 

 shining white. Spores sphaeroid, 4 to ."> /x. 

 Clitocybe piceina Peck. Bull. Torr. CI. :-il ; 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. 



Lamella? 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 u fj.. 



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. Thy species is closely allied to C. cerussata and C. 

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



