64 BOTANICAL GAZETTE [| JULY 
micropyle. The writer proposes the r name mesogamy for this phenomenon.— 
CHARLES J. CHAMBERLAIN. 
Dr. N. WILLE® has begun a series of studies on the Chlorophyceae. The 
first paper contains numbers one to seven, and treats of the structure and 
phases in the life histories of Syézdion Droebakense, n. sp., Trochiscia, Prast- 
ola crispa, Ulothrix flacca and several new species of Ulothrix, Pseudendoclo- 
nium, nov. gen., and certain species of Rhizoclonium. Four excellent plates 
accompany the text.—B. M. Davis 
As A RESULT of experiments conducted in Maryland in the seasons of 
1899 and Igoo, C. O. Townsend finds? that celery blight, caused by the fun- 
gus Cercospora apit, can be prevented by the use of fungicides. The best 
results, apparently, are given by ammoniacal solution of copper carbonate, 
rdeaux mixture being equally good as a fungicide but causing a slight 
stunting of the plants. To obtain the best results the first application should 
be made while the plants are still in the seed-bed, followed by other applica- 
tions every week until cool weather, which checks the progress of the disease. 
—ERnSsT A. BESSEY. 
_ THE SUBJECT of oat smut has received attention in two recent bulletins 
from the Illinois*® and Wisconsin™ experiment stations respectively. In both 
an estimate is given as to the annual loss in the state from this smut, about 
14 per cent. for Illinois and about 6 per cent. for Wisconsin. The results of 
experiments with the hot water treatment at different temperatures are 
described in the former bulletin, the temperature found to be most efficient 
without injury to the germinative power of the grain being 135° F. for five min- 
utes. Both bulletins discuss the formalin treatment, which is shown to be even 
more effective than that with hot water and somewhat more easy to perform. 
— Ernst A. BESSEyY. 
A SHORT NOTE on the abundant and destructive occurrence of the dwarf 
mistletoe, Arceuthobium pusillum, in the upper peninsula of Michigan is given 
in a recent bulletin from the Michigan Experiment Station.? In connection 
with the recent rediscovery of this interesting plant in New England, it is of 
paca Dr. N.: Studien iiber Chlorophyceen. Med. f. d. biol. sta. v. Drébak. 
no. 2. 19 
9 TOWNSEND, C. O.: Notes on aie’ blight. Bull. Maryland Agr. Exp. Sta. no. 
74. pp. 167-182. igh 1-7. May Igor 
*SHAMEL, A. D.: Treatment of oats for smut. Bull. Ill. Agr. Exp. Sta. no, 64, 
pp: 57-72. 6 pls. Urbana. March 1901 
™Gorr, E. S.: Lvs Gina, of oat smut. Special Bulletin, Wisconsin Agr. 
Exp. Sta. pp. 1-4. fig. Madison. March 1go1. 
@ WHEELER; C. F.: The geology and botany of the Upper Peninsula Experiment 
ation. Report of the Upper Peninsula Experiment Station for the year 1900. Bull. 
ace Agr. Exp. Sta. no. 186. PP: 17-28. 4 pis. Dec. 1 
