236 



Science of Plant Life 



Fig. 145. Freshwater alga;. The upright filaments are, from left to right: 

 (Edogonium, producing swimming spores, eggs, and sperms ; Microspora, form- 

 ing resting spores and swimming spores; and Ulothrix, forming swimming 

 spores and gametes. The horizontal filaments are Spirogyra (left) and 

 Vaucheria (right). 



