Witson: NortH AMERICAN PERONOSPORALES 397 
Fungi 64); Minnesota, * Pammel; Nebraska, * Bates 
(Fungi Columb. 7776): South Dakota, * Griffiths (W. 
Am. Fungi 8); Wisconsin, 7release (N. Am. Fungi 
18036). 
TyPE Locatity: Selva, Italy, on Chaetochloa verticillata (L.) 
Scribn. 
DisTRIBUTION : Vermont to South Dakotaand Kansas. Also 
in Europe and Asia. 
Icons :. Bot. Gaz. 11 : f/. 8; Rabenh. Krypt. Fl. ed. 2. 1': 
438. f. 71; Fl. Nebr. 1: pl. 26. f. 4; Berlese, Icon. Fung. Phyc. 
pl. 9. f. ©; Bull. Soc. Bot. Ital. 1902: 169. f 7-37; Bot. Mag. 
Tokyo 11: pl. 2. 
2, ScLEROSPORA Fartowi! Griffiths, Bull. Torrey Club 
34 ¢ 207... 1907 
Infected areas on the leaf-sheaths, rarely on the leaf-blades, 
irregular in outline, usually elongate, brownish with a darker 
border, up to 10 mm. or more in length ; conidiophores unknown ; 
oospores globose, 28-45 4; epispore slightly wrinkled, very 
Opaque, reddish-brown, often appearing almost black. 
Through the courtesy of Dr. Griffiths, material from the type 
locality was available for examination. This species is very dis- 
tinct from S. graminicola, from which it differs in the slightly 
larger and more opaque oéspore with its lighter and smoother ep- 
ispore. The disintegrating influence of the fungus upon the host 
is also absent in the present species, while in S. graminicola this 
is very pronounced. 
On POACEAE: 
Chloris elegans H. B. K., Arizona, Griffiths. 
Type Locatity: Cochise, Arizona, on Chloris elegans H. B. K. 
DisrrisuTion: Arizona and Sonora. 
Species inquirendae 
Three additional species, of which the conidiophores are un- 
nowt have been referred to this genus. The odspores differ 
from those of S. graminicola in their lighter color, the thinner 
epispore, the difficulty of freeing them from the tissues of the host 
in which they are imbedded, and the failure of the affected leaves 
to liberate the odspores by the rapid disintegration of the tissues 
