vie) BOTANICAL GAZETTE [JANUARY 
The Mexican species of the following genera have been brought together: Beau- 
carnea (3 new), Dasylirion (r new’, Nolina (3 new), Castalia (1 new), Bentha- 
mantha (3 new), Dolicholus (3 new), Odonia (3 new), sessile-flowered species of 
Parosela (5 new), some Mexican species of Ionoxalis (17 new), Lotoxalis (3 new), 
Terebinthus (7 new). The North American species of Krameria are presented, 
3 being new. New species are also described under the following additional 
genera: papa Clematis (2), Potentilla, Alchemilla (2), Pithecolobium, 
Bauhinia (3), Cassia (4), Hoffmanseggia, Cologania (2), Geranium (3), Linum 
(2), Polygala (3), pet Wissadula (2), Hypericum (4), Calceolaria, Opuntia, 
Echinocactus, Arracacia (2), Deanea (4), Eryngium (2), Prionosciadium.— 
J.M.c 
NOTES FOR STUDENTS 
Plant diseases—JonEs and Morse have published further results of their 
studies of the Irish-potato diseases in Vermont.® Spraying late potatoes with 
Bordeaux mixture for late blight and rot, due to Phytophthora infestans, gave an 
average gain per acre, during fifteen years and covering a number of varieties, of 
119 bushels. Against early blight, due to Alternaria solani, three sprayings 
with Bordeaux gave very much increased yields. When loss from rot is antici- 
pated, potatoes should be exposed as long as possible to the sun and air before 
being placed in storage. Cold storage was found to reduce greatly the damage 
from rot during storage. Liming and formalin disinfection were of no value. 
Against potato scab, due to Oospora scabies, formalin gas proved effective, even 
better results secured in this manner than by soaking in formalin solutions. 
Srewart, Eustace, and SrrriNe have published the results of the fourth 
year of their ten-year spraying experiment with potatoes.? Soda-Bordeaux did 
not prove more satisfactory than the usual lime-Bordeaux. In thirteen of the 
experiments reported the average gain due to spraying was $20.04 per acre, 
while the average cost of spraying for the same experiments was +4. 25 per acre. 
Coss presents further studies on the gumming of sugar cane,® a bacterial 
disease, due to Bacterium vascularium (Cobb) Greig-Smith, first described by 
the same author from Australia. One of the prominent symptoms of the disease 
is the escape of a yellowish slime or gum from the cut end of the stem. The 
disease affects chiefly the vascular bundles, but the parenchymatous tissues 
are also attacked, and in the upper part of the stem cavities, which contain as 
6 Jones J. R. and Morse, W. J., Potato diseases and their remedies. Rept. 
Vt. Exp. Stat. 18: 272-291. 1906. 
7 StEwart, F. C., Eustace, H. J., and ee F. A., Potato spraying experi- 
ments in 1905. Bull. N. ¥. Geneva Exp. Stat. 279:151-229. pl. I-5. map I. 1906. 
See also Bull. N. Y. Geneva Exp. Stat. 264:93-204. pl. I-16. map I. Rev. in Bor. 
GAZETTE 41:364. 1906. 
8 Coss, N. A., Third report on gumming of the sugar-cane. Bull. Div. Path. © 
and Phys. Hawaiian Sugar Planters’ Assoc. 3:1—46. figs. I-12. 1905. 
