PLATE 48 

 Ectocarpus chantransioides S. and G. 



Figs. 28, 29. Characteristic terminal ramuli with characteristic gametangia. 

 X loO. 



Fig. 30. Diagrams showing the pulvinate habit of growth. One in the upper 

 right-hand corner rejiresents a vertical section view. 



Fig. 31. Illustrating the creeping filaments. X 150. 



Ectocarpus commensalis S. and G. 



Fig. 32. A grouj) of plants with relatively long gametangia. X 50. 



Fig. 33. A single typical gametangium and parts of filaments showing 

 chromatophores. X 225. 



Fig. 34. A group of young filaments with long rhizoids. 



Fig. 35. A group of plants showing their relation to the host. Diagrammatic. 



Ectocarpus acutus S. and G. 



Fig. 36. A diagrammatic illustration showing method of branching and tlie 

 shape and position of the gametangia. 



Fig. 37. A group of gametangia showing some variations in form and size. 

 X 125. 



Fig. 38. A piece of a filament showing shapes of cells and chromatophores. 

 X 125. 



Fig. 39. A few terminal acute ramuli. X 125. 



[424] 



