Plate 79 



Figs. 1^. Nitella flexilis (L.) C. A. Agardh: 1, habit, x 1; 2, oogo- 

 nium and antheridium, X 40; 3, apices of dactyls, x 30 



Figs. 4-10 Nitella opaca C. A. Agardh: 4, habit, x 1; 5, branchlets 

 with oogonia, x 5; 6, branchlets with antheridia, x 5; 

 7, oogonium without coronula, x 25; 8, antheridium, 

 x 15; 9 and 10, apices of dactyls, x 40 



[818] 



