[Chap. XLVII 



THE ALGAE 



619 



Fig. 282. Common filamentous algae. Genera represented: A, Stigeocloniiim; 

 B, Ulothrix; C, Spirogijra; D, Tribonema; E, Chaetophora; F and G, Zijgnema; H, 

 Mougeotia; I, Vaucheria; J and K, Oedogonium. 



