PLATE 49 



Ectocarpus acutus S. and G. 



rig. 40. A group of terminal ramuli bearing numerous complex zoospo- 

 rangia(?). X 125. 



Fig. 41. A group of typical gametangia. X 125. 



Ectocarpus cylindricus f. codiophilus S. and G. 



Fig. 42. Piece of a filament bearing zoosporangia. X 125. 

 Fig. 4,3. Piece of a filament bearing opposite typical gametangia. X 125. 

 Fig. 44. Piece of a terminal filament bearing zoosporangia. X 125. 

 Fig. 45. A group of plants showing the typical crowded basal gametangia. 

 X 65. 



Ectocarpus cylindricus f. acmaeopliilus S. and G. 



Fig. 46. Piece of a typical filament bearing opposite sessile gametangia. 



X DO. 



[426] 



