40 BOTANICAL GAZETTE. 
description of the conidia being taken from Schroeter. In the Wisconsin spec- 
imens bodies were found on the surface of the leaves which may perhaps have 
been the conidia, but the material examined was not in sufficiently good con- 
dition to enable me to speak with certuinty. The oospores are borne superfi- 
cially on the leaves, and may be seen with the naked eye as dark brown specks. 
They readily fall from the leaves and collect in the form of a powder in her- 
barium envelopes. The endospores are very thick sometimes, in American 
specimens as thick as 4, which is thicker than reported European specimens. 
The exospore of other Peronospore is here represented by merely a thin film, 
whose surface is more or less roughened, but the oogonium wall itself, which is 
very thick and of a dark brown color, serves the purpose of an exospore, and 
instead of the spore escaping from the oogonium, as is generally the case, the 
oogonium falls from the leaf with the spore. The antheridia are plainly seen 
in Wisconsin specimens, even after having been dried for several months. 
32. Cystopus candidus. 
Also on Nasturtiwn pahistre near Chicago, Arthur; and on Sisymbrium can- 
escens With oospores, Arizona, H. H. Rusby. 
33. C. cubicus. 
On Artemisia biennis, Wisconsin, Trelease. 
34. C. Bliti. 
On Amarantus blitoides, lowa, Arthur, 
Besides the above, P. nivea and P. Vicie are mentioned in a 
Partial List of the Fungi of Wisconsin, by Dr. W. F. Bundy, in 
‘ Bis ate 
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Sct swale yatta 
Ye Ae 
the first volume of the Geology of Wisconsin. The hosts on | 
which these species grew is not mentioned, but Dr. Bundy kind- 
ly informs me that P. Vicie grew on cultivated peas in his gar- 
den, but he does not recollect the host of P. nivea, and unfortu- — : 
nately his specimens and notes on the subject were lost. 
A Botanieal Holiday in Nova Scotia. Hf. 
BY T. J. W. BURGESS, M. D. 
d by the advertisements to believe that if we reached Port — 
Le 
Mulgrave, on the G 
