Plate 80 



Figs. 1-7. Nitella tenuissima (Desv.) Kuetzing: 1, habit, x %; 2, 

 branchlet, x 55; 3, 4, and 6, apices of dactyls, x 80; 5, 

 oogonium, x 85; 7, branchlet, x 25 



Figs. 8-12. Chora Schweinitzii A. Braun: 8, portion of plant, x l^^; 

 9, branchlet, x 6; 10, sex organs, x 25; 11 and 12, 

 apices of branchlets; 11, x 13; 12, x 25 



820 



