66 THE CHICAGO ACADEMY OF SCIENCES 



Marasmius nigripes Schw. 



Pileus membranaceous, campanulate, umbonate, striate, 

 somewhat pellucid, pure white. 



Lamellae adnate, arcuate, rather broad, pure white, growing 

 pale. 



Stems somewhat bulbous, black, white-farinose. 



The stems are 3.5 cm. long, black but wholly covered over 

 with a white meal which may easily be rubbed off. 



On dead leaves in woods. June, July. The white-mealy 

 covering gives the stem a leaden-gray appearance. Pileus 8 to 

 16, exceptionally 25 mm. broad. Spores resembling in shape the 

 seed of buckwheat. For a good figure of the species and of its 

 peculiar spores, see Lloyd's Mycological Notes, No. 107. 



LENTINUS. 



Pileus fleshy-coriaceous, pliant, or in fleshy species becoming 

 hard when old, persistent; hymenophore continuous with the 

 stem or at the base of the pileus when sessile; lamellae concrete 

 with the hymenophore, thin, unequal, membranaceous, with the 

 edge serrated or torn in a toothed manner. Growing on wood. 

 Spores somewhat round, even, white. 



(Hennings, in Pflanzenfamilien I 1 ** p. 222, reduces this to a 

 subgenus of Panus, stating that the two genera cannot be separated 

 for the reason that "in most of the Lentinus species the lamellae 

 are entire; being serrate only in the fleshy kinds.") 



Pileus stipitate . . . 1 



Pileus sessile L. pelliculosus. 



1. Pileus scaly 2 



1. Pileus villous L. Lecomtei. 



1. Pileus- smooth L. cochleatus. 



2. Pileus thick, convex or depressed L. lepideus. 



2. Pileus thin, umbilicate L. tigrinus. 



Lentinus pelliculosus Fr. 



Sessile, imbricated. Pileus tough, membranaceous, reniform, 

 very thin, strigose, brown-tawny, the margin naked, involute. 



Lamellae broad, torn, pallid. "Pileus strigose with a dense 

 hairy coat like the skin of some animal." Morgan. 



On a stump of Quer^us, woods, Glencoe. September, 1902. 

 The coating of the pileus is tawny-cinnamon on the disk, paler 

 toward the margin, and is like a very coarse tomentum, the in- 

 dividual hairs or fibers of which are about 2 mm. in length. Spores 

 pure white, globose, 3 p. in diameter. 



Lentinus Lecomtei Fr. 



Pileus fleshy-tough, infundibuliform, reflexed, hairy, tawny. 



Lamellae serrate, crowded, pallid. 



Stem short, hairy. 



Pileus 2.5 to 7.5 cm. broad. 



