82 Witson: NortH AMERICAN PERONOSPORALES 
west of Ouray, Colorado, September 8, Ig0I, at an altitude of 
2,300-2,500m. On Biitum capitatum L. f 
On CHENOPODIACEAE : 
Blitum capitatum 1., Colorado, * Underwood & Selby 108, 
(Type.) : 
Chenopodium rubrum L., Montana, Kelsey. 
_. This material was referred in the herbarium of the New York 
Botanical Garden to A. Biiti, but a superficial examination of the 
conidia was sufficient to throw doubt upon the correctness of the 
identification. The conidia differ in their yellow color and in their 
discoid form from those of A. Bitz, and from those of A. platensis 
in the brighter color and uniformly hyaline membrane, while in out- 
line they approach most nearly to those of A. tropica. The oospores, 
however, are markedly different from those of these species or of 
any other member of the genus. They are very closely reticulate, 
with the areolae so shallow as at first sight to give the appearance 
of pitting rather than reticulations. This is our rarest and most 
local species, yet none are more markedly distinct. _ It is repre- 
sented in the material examined by only two collections, while but 
one American mycologist has referred to an A/bugo which could 
belong to the present species. The inclusion by Berlese and 
DeToni* of Avriplex among the hosts of A. Bliti appear = 
_ be the first mention of a species of this genus on a Chenopod'- 
_aceous host. No locality is given nor can the host be traced by 
‘any bibliographical assistance at hand. Later Pammel f reported 
the occurrence of A. Bliti upon the sugar beet in Iowa and 
mentions its occurence on Blitum. He figures the conidia from 
Beta and the odspores from Amaranthus, as they were not found on 
the former host. Later the same author { cites references to the 
occurrence of A. Bliti on Chenopodium in Europe, but 70° light 
has been gained from them. _ ; 
Disrrisurion: Montana and Colorado. Probably also ” 
Iowa and Europe. a 
*Sacc. Syll. Fung. 7: 236. 1888. 
7 Bull. Iowa Agr. Expr. Sta. 15 : 236. l. 6. 1891. 
Jour. Myc. 7: 102. 1892. 
