68 Witson: NortTH AMERICAN PERONOSPORALES 
Brassicaceae sp., Montana, Anderson. 
The following additional hosts are reported within our limits : 
Arabis glabra (L.) Bernh., Brassica Napus L., B. oleracea Li, 
Cakile edentula (Bigel.) Hook., Cheiranthus sp. cult., Coronopus 
sp., Draba caroliniana Walt., Lepidium campestre (ls) Ri Bey 
sativum L., Roripa Nasturtium (L.) A. S. Hitchcock, and Sinapis 
alba L. 
Type Locauity : Europe, on 7h/aspi Bursa-pastoris L. = Bursa 
Bursa-pastoris (L.) Britton, 
DistripuTion: Southern Canada to Mexico, Bermuda, and 
the West Indies. Also in South America, Europe, Asia, Africa, 
Australia, and New Zealand. 
2. Albugo sibirica (Zalew.) 
Cystopus sibiricus Zalew. Bot. Cent. 15: 222. 1883. 
No material of this species has been examined. It is known — 
only from the original description, where it is recorded from some 
species of Boraginaceae from Siberia erroneously referred by Baron 
von Thiimen to Echinospermum Lappula. It is said to differ from 
A. candida in its smaller measurements and in the structure of the 
epispore of the oospore. 
3. Albugo tropica (Lagerh.) Lagerh., ined. 
Cystopus tropicus Lagerh. ; Pat. & Lagerh. Bull. Soc. Myc. France 
m 393: $802, 
This species was described from Ecuador on some unidentified 
species of Piperaceae. Material in the herbarium of the New 
York Botanical Garden from the type locality, and presumably 4 
part of the original collection, is on Peperomia pellucida H.B.K., 4 
species which is also widely distributed in the West Indies and 
Central America. 
4. ALBuGoO IpOMOEAE-PANDURANAE (Schwein.) Swing. 
jour. Myc. 7; t52.° 69% 
Aecidium [pomoeae-panduranae Schwein. Schr, Natur. Ges. Leip- 
zig 1: 69. 1822. 
Caeoma convolvulatum Link, in Willd. Sp. Pl. 67: 49. 1825. 
Uredo Convolvulae Spreng. Syst. Veg. ed. 16. 4: 572. 1827- 
