PLATE XII. 



Fig. 1, radicle with zoospores Botrydium grauulatum. 



a, cells highly magnified, showing radicles; b, an aborted 

 cell; c, scattering of microzoogonidia; d, cells slightly mag- 

 nified; e, zoospores several days old; /, younger zoospores. 



" 2 Vaucheria tuberosa. 



' 3 Vaucheria geminata racemosa. 



