400 Witson: NortTH AMERICAN Ei ALES 
and with the exception of the lowest rarely with well developed 
secondary branches, 90-350 x 9-12 4; conidia obovoid, basally 
papillate, hyaline, 18-25 xX 12-15 fe; oospores surrounded by 
periplasm at maturity, 25-35 #3 odgone persistent, wrinkled, yel- 
lowish-brown, as is also the epispore. 
In Europe two other members of the order occur upon species 
of Geranium, but so far they have not been recorded from Amer- 
ica nor has the present species been found abroad. The material 
issued under this name by Allescher and Schnabel in their Fungi 
Bavarici 555 is Plasmopara pusilla, a much smaller species with 
almost simple conidiophores. Neither of these species is as large 
as FPeronospora conglomerata Fuckel. The mycelium, according 
to Dr. Halsted,* is perennial. 
On GERANIACEAE : 
Geranium carolinianum L., Alabama, Carver 150, Earle, 
Underwood; Georgia, Underwood 22424; Illinois, 
Earle, Pammel, * Seymour (Fungi Europ. 3176, N. Am. 
Fungi zgog); Indiana, Arthur, Underwood (Econ. 
Fungi 43, Indiana Fl. roo); Mississippi, 7vacy; Mis- 
souri, Galloway, Pammel, Trelease ; New Jersey, Ellis, 
Fairchild ; North Carolina, Stevens. 
Geranium dissectum .., Mississippi, Tracy (Fungi Columb. 
405, on “Geranium carolinianum’’). 
Geranium maculatum L., District of Columbia, Galloway 
1357; Indiana, Olive; Massachusetts, Farlow (N. Am. 
Fungi 278); New York, Jackson 1154, Thom; On- 
tario, Dearness (Fungi Columb. 2048); West Virginia, 
Sheldon ; Wisconsin, Davis, Pammel. 
Geranium pusillum L., Louisiana, Langlois 942° South 
Carolina, Rolfs 1689. 
? Geranium phate Fisch. & Traut., Wyoming, Pam- 
mel & Stanton. 
This species has also been reported from our limits on (Grera- 
nium Robertianum L.. 
Type tocauity: North Greenbush, N. Y., on Geranium mact- 
latum L. 
* Bot. Gaz. 15: 321. 1890; 16: 338. 1891. 
