PLATE XXI. 



Pig. 1 (After Wolle) Oedogonium. 



a, b, zoospores escaping; c, d,f, zoospores germinating; e, 

 androspores escaping. 



2 Oedogonium wolleanum. 



,i. fruiting filaments greatly magnified; 1>, androsporous 

 filament: c, fruiting filament. 



" 3 Oedogonium polymorphum. 



a. androsporous filament; b. female filament. 



i Oedogonium stagnale. 



<i, female filament; b. androsporous filament, 

 .-) Oedogonium borisianum. 



