° 
220 BOTANICAL GAZETTE. 
sis, B. & C., a point which can only be settled by a comparison 
with the type of P. Cubensis in the Berkeley herbarium at Kew. 
the specimen in the Curtis herbarium not being satisfactory. 
During the past year I have received specimens of Peronospor@. 
from various sources, including a few forms new to this country, 
and largely increasing the list of host-plants of species a 
e@ 
known to occur with us. P. Halstedii appears to be on 
whole our most widely diffused species, and to the comparatively 
large list of hosts already enumerated in the Gazer, thirteen 
in all, several more species are to be added. The species reaches 
its most luxuriant development on species of Si/phiwm and Heli- 
anthus in the Western States but, abundant as are the conidia, 
the oospores are not often met with. Mr. Holway has found 
what appears to be Peronospora calotheca, De Bary, although no 
oospores were seen, on Galium Aparine in Iowa, and P. Vici on 
V. Americana, as well as P. Sicyicola on Echinocystis lobata. 1 
received from Mr. J. Fletcher some grapes gathered at Ottawa, 
Canada, in August, 1884. The young grapes and their pedicels 
were covered with a dense growth of Peronospora viticola, in fact, 
denser than I have ever seen on the leaves of vines. Mr. Fletcber 
reports that the fungus was very destructive to grapes near 
tawa. It is somewhat surprising to find such a luxuriant 
growth of the fungus on the grapes themselves in so high a lati- 
tude as that of Ottawa, for most of the reports of the occurrence 
of the fungus on the grapes have come hitherto from warmer 
climates. 
zungsbericht, Bot. Ver, Brandenburg, xxii. 62. The paper és 
_ entitled “ Ueber ein siidafrikanisches Cecidium von Rhus pyroides 
Burch,” and D 
due to the action of insects, as in most of the so-called Ervine, 
but is caused by a fungus which he thinks is probably a specie 
. Exobasidium. In the deformities which they produce the Ea 
eee, resemble the species of Exoascus, and judging by Die 
Thomas S account of the fungus found by.him ina sterile condi- 
a It seems not unlikely that it was an Exoascus like out owe 
Persons owning copies of the Herbar. Mycolog. may be able t0- 
give further information on this subject. One would not natu 
