302 



Ulotricliales 



Fig. 195. Trichophilus Welckeri Weber v. Bosse. A, thallus within a hair of Bradypus (the 

 Three-toed Sloth), with some of the cells forming zoogonidangia ; B, a single zoogonidium ; 

 C. a group of smaller motile cells (gametes ?). All x 470 (after Weber van Bosse, from Wille). 



Fig. 196. A C, Gongrosira viridis Kiitz., x500. D F, G. stagnalis (G. S. West) 

 Schmidle, x 200. zg, zoogonidangium. 



