1220 
Wisconsin Academy of Sciences , Arts and Letters, 
EXPLANATION OF PLATE XCI. 
The photomicrographs in this plate were made with the Zeiss camera 
in combination with the Zeiss apochromatic objective 8, and compensat¬ 
ing ocular 12. The' magnification is about 210 X. 
Dactylococcus infusionum 
All of the illustrations in this plate were made from cultures one 
month old. The alga was grown in 1.0% Knop’s solution with the ad¬ 
dition of 1.0% glucose. 
Figs. 127-132, 137. Colonies showing characteristic manner of branch¬ 
ing. 
Figs. 130, 133-135. Cultures showing isolated cells with some joined 
laterally. 
Figs. 138-141. Colonies with reticulate arrangement of the cells. 
