PLATE 47 



Ectocarpus eramosus S. and G. 



A group of typical gametangia showing the range of relative shapes 

 X 60. 

 Part of a filament showing an intercalary gametangium. X 60. 

 A part of a filament near its outer end, showing variation in shapes 

 and sizes of the cells and scattered dwarf gametangia. X 60. 



Fig. 21. The basal parts of a group of erect filaments showing long rhizoidal 

 filaments. X 60. 



Fig. 22. A filament showing two gametangia with long pedicels. X 60. 

 Fig. 23. Terminal parts of filaments, one showing chromatophorcs. X 60. 



Ectocarpus flocculiformis S. and G. 



Fig. 24. A group of filaments anastomosing at the base and developing 

 numerous rhizoids and characteristic gametangia. X 125. 



Ectocarpus flagelUferus S. and G. 

 Fig. 25. Showing an intercalary gametangium. X 125. 

 Fig. 26. Showing normal gametangia and chromatophorcs. X 125. 

 Fig. 27. Showing basal parts of filaments. X 125. 



[422] 



