PLATE 54 



Compsonema secundum S. and G. 



Fig. 1. Three fragments of plants showing small gametangia on short 

 pedicels from a basal filament and complex terminal gametangia with mostly 

 secund lateral developments. X 125. 



Fig. 2. Fragment of a plant showing a modification in which the game- 

 tangia are mostly temiinal and erect, and only rarely possessing lateral pro- 

 tuberances. X 125. 



Compsonema pusillum S. and G. 



Fig. 3. Three fragments of plants showing shapes and positions of zoospo- 

 rangia and gametangia. Character of the creeping and of the erect filaments, 

 and a feAv branches pushing between the surface cells of the host. X 125. 



Compsonema secundum f . terminale S. and G. 



Fig. 4. Fragment of a plant showing the characteristic terminal and large 

 lateral gametangia. X 125. 



Fig. 5. Filament which seems to be producing zoosporangia below an empty 

 gametangium. X 125. 



Compsonema tenue S. and G. 



Fig. 6. Fragments of plants showing erect filaments, true hairs, and zoospo- 

 i-angia (?) and gametangia sessile on the creeping filaments. X 250. 



This plate is a reprint of Setchell and Gardner, Univ. Calif. Publ. Bot., vol. 7, 

 p. 372, pi. 37, 1922. 



[780] 



