1893.] NATURAL SCIENCES OF PHILADELPHIA. 465 



Isaria Virginiensis E. & E. 



On the young stroma of Hypoxylon rubiginomm (Pers) ? Nut- 

 tallburg, West Va. July 1893. (L. W. Nuttall, Nos. 95 and 102). 



Stromata gregarious, simple, slender clavate, l?-2 mm. high, yel- 

 lowish-white, obtuse and subcapitate at the apex, curved, often decum- 

 bent, clothed nearly to the base with spreading, hyaline, dendroid, 

 l?-2 branching hyphae (sporophores) 40-45 x 2 ip., their tips often 

 toothed and bearing 1-4, elliptical or ovate, hyaline 3ix2i'/, 

 conidia. 



Analogous to Isaria umbrina Per. (InsUtale acariforme Fr), but 

 differs in several respects. 



Illosporium minimum E. & E. 



On rotten wood. Prof. Geo. F. Atkinson (No. 308). 



Sporodochia minute, 75-85// diam., contracted below into a very 

 short stipe or subsessile, white at first, becoming yellowish. Hyphae 

 articulate, di-trichotomously branched, the articulations biconical, 

 5-6// diam. 



Resembles i". pallidum Cke. , but that has sporodochia 200-250// 

 diam., with the subglobose terminal articulations of the hyphae 

 8-10// diam. 



Cylindrocolla acuum E. & E. 



On fallen leaves of Pinus rigida, Newfield, N. J. June, 1893. 



Sporodochia superficial, suborbicular, flattened, pale- flesh color, 

 sometimes sublobate 1-1 mm. diam. , margin and lower side paler. 

 Sporophores branched, soon separating into cylindrical hyaline, 3-4 

 nucleate, concatenate, subtruncate conidia 12-15x2-2?//. 



Strumella steganosporioides E. & E. 



On dead limbs of Oarpinus Americana, London, Canada. June 

 15, 1893 (Dearness, No. 2117). 



Sporodochia tubercular, of cellular structure, dirty white inside, 

 1-1 mm. diam., sometimes 2-5 connate in a single tubercle. Conidia 

 obovate, globose or subelliptical, 23-35// in the longer diameter, 

 olive-brown, reticulate, hollow and fragile, like the conidia of Steg- 

 anosporium, forming a nearly black layer, attached to the superficial 

 cells of the sporodochium by a very short, thick pedicel. 



