PLATE 37 



Compsonema semmdum 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. A fragment of a plant showing a modification in which the game- 

 tangia are mostly terminal 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 few branches pushing between the surface cells of the host. X 125. 



Compsonema secundum f. terminate S. and G. 



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

 lateral gametangia. X 125. 



Fig. 5. A 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- 

 rangia ( ?) and gametangia sessile on the creeping filaments. X 250. 



[372] 



