Clements and Shaiita: a new gknus of bluegreen algae. 135 



by Dr. Shantz in 1903, 1904, 1905. The type specimens are in the 

 herbarium of the University of Minnesota, and in the collection of 

 Dr. Shantz ; cotypes are in the collections of Dr. Aloore and Dr. 

 Setchell. 



Explanation of Plate. 



jNIagnification : 500 in figures 1-7; 3,000 in figure 8. 

 Figure i. Late stage of an 8-celled colony. 



Figure 2. i6-celled colony dividing to produce a 32-celled colony. 

 Figure 3. 64-celled colony. 

 Figure 4. Early stage of 128-celled colony. 

 Figure 5. Late stage of the same colony. 

 Figure 6. 512-celled colony. 

 Figure 7. Surface view of the same colony. 



Figure 8. a, normal spherical cell ; b, c, d, successive stages of cell 

 division. 



