36 



Cincinnati Society of A T atural History. 



NEW NORTH AMERICAN FUNGI. 



By A. P. Morgan. 



The following genera and species of fungi and myxomycetes from 

 various localities seem to me new and not hitherto described. 



(See Plates I, II, III. The figures on these plates are numbered to correspond with 

 the numbers of the species, the letters are explained in detail under " Explanation of Plate.") 



1. Bolbitius radians. — Pileus fleshy-membranaceous, convex 

 then expanded and depressed, sulcate, viscid, pale pinkish or ferrugi- 

 nous, growing darker. Stipe more or less elongated, tapering upward, 

 hollow, flocculose, white. Lamellae free, ferruginous. Spores ferruginous 

 elliptic, 12-14x8 mic. 



Growing on old straw, horse manure, etc. Canada Dearness ; Ohio, 

 Morgan. Pileus 4-6 cm. in diameter, the stipe 6-10 cm. in length. 

 The delicate pellicle on the pileus breaks up into scales on the disk 

 and splits into fibers along the furrows ; these extend more than half 

 way from the margin. The habit is quite differentfrom that of 

 Aga?-icus (Galera) lateritius. Fr. 



2. Marasmius melanopus. — Pileus membranaceous, convex, 

 glabrous, not striate, purplish gray. Stipe slender, hollow, glabrous, 

 black, smooth, polished and shining. Lamellae adnate, somewhat 

 distant, rather broad, purplish-gray. Spores obovoid, apiculate, 

 5-6x2.5 mic. 



Insititious on old leaves, late in autumn. Preston, Ohio. Pileus 

 4-6 mm. in diameter, the stipe 2-4 cm. in length. Both the pileus 

 and the lamellae are of the same uniform substance and color ; the 

 black polished stipe does not become paler at the apex. 



LENTODIUM, Gen. Nov. 



Pileus fleshy-coriaceous, tough, hard when dry, persistent. Stipe 

 more or less elongated, tough, central or eccentric, confluent with 

 the hymenophore. Hymenium porose cellulose, the lower surface 

 veiled by a thick persistent membrane, which is at length radiately 

 dehiscent. Spores white. 



A genus of the Agaricini quite remarkable for the peculiar 

 structure of the hymenium, which very much resembles that of 



