57 
conidia vary sufficiently with ecological conditions to make it 
sana to depend on them alone for differential characters. 
T. s of Peronospora on five families of hosts were dis- 
cussed, a especial reference to the American species. The 
Leguminosae harbor four species of the genus, two being Amer- 
ican and all European. One of these, P. trifoliorum, is of some 
are strictly Americans and of rather restricted range. The 
ink Family harbors six species, three of which are found in 
ee merica, one being endemic. On the Cruciferae three coarse 
are recognized, one European, one P. parasitica, appears to be 
cosmopolitan, and an undesctibed species ee be strictly 
American. On various Cen podiaceous hosts there occur 
three species of ene rat being fee and both 
rather widespread, but by no means among the more abundant 
species of the genus. ane separated as early as 1852 as 
separate sae these have been frequently ae together 
uch confused by mycologists. The third species, 
P, ae is confined to beets in Europe 
t the conclusion of the discussion of this report, Professor R. 
A. Harper and Professor H. A. Gleason gave interesting accounts 
of the sessions of the various botanical sections of the American 
Association for the Advancement of Science, recently held at 
Cleveland, Ohio 
NOTES, NEWS AND COMMENT 
Dr. N. L. Britton, director-in-chief, sailed for the wes Indies 
January 25, on an exploring expedition, accompanied by Dr. J. N. 
Rose, Dr. J. A. Shafer, Mrs. Britton, and Miss Delia eae 
Dr. W. A. Murrill, assistant director, visited ee 
at Cornell University on January 15, and Professor Peck a 
Albany on January 17, to examine types of some of the poisonous 
species of fungi 
