Witson: NortH AMERICAN PERONOSPORALES 415 
Cucumis sativus L., Florida, Hume 24 ; Massachusetts, 
Humphrey; New Jersey, Halsted (N. Am. Fungi 
2426a; Econ. Fungi gr), Stevens ; Maryland, Dorsett ; 
Ohio, Se/by (Phyc. Prot. 17g); West Virginia, She/don, 
? Cucurbita maxima Duch., New Jersey, Halsted (N. Am. 
Fungi 24266). 
Cucurbita ovifera L., Ohio, Duvel. 
Cucurbita Pepo L., Ohio, Duvel. 
Lagenaria vulgaris Ser., Ohio, Duvel. 
Micrampelis lobata (Michx.) Greene, Ohio, Se/by. 
Momordica balsamina L., lowa, Arthur. 
: Mukia scabrella Arn., Ohio, Duvel. 
The following additional hosts are reported from within our 
limits: Cucumis Anguria L., Melothria scabra Naud., Momordica 
charantia L., Sicyos angulatus L.., Trichosanthes colubrina Jacq. 
Type Locaity: Cuba, on some unidentified species of Cucur- 
bitaceae. 
DistriputTion : New Hampshire to Minnesota, Texas, Florida, 
and Cuba. Also in South America, Europe, Asia, and Africa. 
Icones: Riv. Pat. Veg. 9:125.f. 27; Rep. Mass. State Agt. 
Exp. Sta. 8: pl. 2. f. r1-14; Bull. Ohio Agr. Exp. Sta. 89 : pl. 
7; Rep. Fla. Agr. Exp. Sta. 1899-00: p/. 7; Rev. Myc. 22 : pi. 
203. f.7-9; Rep. Conn. Agr. Exp. Sta. 1904: f/. 37. 
2. Pseudoperonospora Celtidis (Waite) 
Peronospora Celtidis Waite, Jour. Myc. '7:105. 1892. 
Plasmopara Celtidis Berlese, Icon. Fung. Phyc. 16. 1898. 
Peronoplasmopara Celtidis Clinton, Rep. Conn. Agr. Exp. Sta. 
1904: 334. 1905. 
Hypophyllous, infected areas brownish, limited by the veins, 
from less than 1 mm. up to covering a large portion of the leaf; 
_ €piphyllous discoloration purple with a more or less pronounced 
yellowish margin ; conidiophores scattered, 200-320 X 6-8 pt, 4-5 
times branched, the ultimate branchlets straight or slightly re- 
curved, about 5-8 » long; conidia elliptic, 12-26 x 20-40 #, 
smoky or somewhat purplish ; oospores in the leaves, 26-4 5B; 
€pispore thin, yellowish-brown, irregularly thickened ; odgone 
Persistent, thin-walled, smooth. 
This species is remarkable as the only member of the order 
