BRIEFER ARTICLES. 
Pleodorina in Indiana.—On the eleventh of last May the writer col- 
lected specimens of Callitriche heterophylla Pursh, and Witella sp.? 
from a shallow, stagnant pond near Bloomington, Ind. A small 
quantity of this material was kept fresh in a bell-jar in a north win- 
dow of the laboratory. On June 29th, while searching for unicellular 
alge for the use of my class, I noticed numbers of little, pale green 
specks along the wall of the glass vessel below the surface of the wa- 
ter. They were at once taken to be Volvox. A microscopic examin- 
ation convinced me, however, that these plants differed from any Vol- 
vox that I had ever seen. der 
Having no special literature on the Volvocinez, I did not feel cer- 
tain as to the precise limits of the genus Volvox. 
However, a study of the life history was begun immediately as, in 
the specimens in question, the asexual development from the gonidia 
could be very readily followed. 
While in the midst of my investigations, the Botanical GAZETTE 
for July, to my agreeable surprise, brought me the paper of Mr. W. 
R. Shaw of Stanford University on “Pleodorina, a new genus of the 
Volvocineze.” 
A glance at this paper convinced me that the organism at hand was 
Pleodorina Californica Shaw, and a closer comparison confirmed the 
opinion. Almost every detail in the study made by me agreed with 
those presented in Mr. Shaw’s paper. 
Together with few minor details which may be of little importance, 
Some of the specimens examined by me, however, were a little larger 
— the measurements given in the paper. The plant body of the 
“gest individuals observed, measured 352/4 in diameter, the gonidia 
“ine Previous to the first division, 24-32/4; vegetative cells, just one- 
2 of the gonidia in the same colony, 12-164. ; 
ae July 27th the plants, then numbering thousands in the same 
na seam In good condition, multiplying rapidly. As this 
shan © be hoped that the sexual reproduction, if sone oi a 
yy may occur and be observed this fall.—David M. Mo 
‘ana University, Bloomington. 
Se lin in Illinois——The new alga Pleodorina California ef 
abund in the July Gazerre was found during the month of co Z 
wher ance at Havana, IIl.. by Prof. T. J. Burrill and myself. ae 
€ the University of Illinois has its new Experiment Station 
