Contributions to Our Knowledge of the Freshwater Algae of Africa. 39 
Fig. 15. — Cosmarium suhprotumid^ini, Nordst., subsp. simp/ex, F. E. Fritscli, n. 
subsp. I, II, V, var. /3. VIII-X, var. a. VI, VII, and XI, forms of var. f3. 
Ill, IV, forms of var. a. x 1000. 
