BULLETIN OF THE BUSSEY INSTITUTION. 427 
Bary, we are indebted to Dr. C. E. Stahl, is more like our plant, yet 
different. Of P. nivea, Unger, we have a number of specimens on 
Aigopodium Podograria, collected near Strassburg; and, in spite of 
the fact that, as a rule, the species of Peronospora are limited to 
particular species of phanerogams, or nearly related species, we can 
see absolutely no difference between European specimens on an Um- 
bellifer and our own on Geranium. De Bary describes P. nivea as 
being only rarely tripartite at the tip, while our European specimens are 
as often tri- as bi-partite. The same is true of American specimens. 
The shape and size of the conidia is the same in both specimens. In 
both the apex is obtusely papillate; and, if there is any difference in 
the odspores, it is that the epispore of American specimens is a little 
the thicker. We have, unfortunately, never seen the germination of 
the conidia in American specimens. 
Peronospora vitico.a, B. & C. Botrytis cana, Herb. Schw. De 
Bary, 1. c. No. 40, Berkeley, Not. N. A. Fungi, Grevillea, March, 1875. 
Ravenel Fung. Car. Exc. V. 90. Grape mould. Mycelium varicose, 
haustoria abundant, small, spherical. Conidial-bearing hyphe fascicu- 
late 4-10 from each stoma, axis simple, slightly undulate, branches 
few on the upper part of axis, short, alternate, beset with secondary 
and tertiary branchlets. ‘Tips closely tripartite. Conidia oval, desti- 
tute of terminal papilla. Germination by zodspores. Odspores numer- 
ous, small, epispore smooth, slightly yellow. Plate IIL, Fig. 1. Plate 
IIl., Figs. 2— 8. 
Common in the Atlantic and Central States on Vitis Labrusea, L., 
V. estivalis, Michx., V. cordifolia, Michx., V. vulpina, L., and their 
cultivated varieties. Odspores on V. estivalis. 
PERONOSPORA GANGLIFORMIS, BERK. Journal Hort. Soc. London, 
1, p. 51, tab. 4, De Bary, |. c. No. 6. Lettuce mould. 
Mycelium slightly torulose. Haustoria ovate, conidial-bearing hy- 
phz several times dichotomous, slender, swollen at the tip into a 
round or slightly funnel-shaped body, from the circumference of which 
radiate several, two to eight, processes, which bear the small roundish 
conidia. Germination by a terminal tube. Odspores small roundish, 
epispore thin, yellow. 
Common on lettuce, Watertown, Mass. On Lactuca altissima, Bot. 
Gard. Cambridge, 1874. On WNabalus albus, Wood’s Hole, Aug. 
1875. 
