PLATE 45 



Coilodesme rigida S. and G. 

 Fig. 76. Section perpendicular to the surface of the frond. X 125. 



Coilodesme hulligera Stroemf. 



Fig. 77, Surface view. X 250. 

 Fig. 78. Cross-section. X 250. 



Punctaria chartacea S. and G. 

 Fig. 79. Cross-section of a sterile frond. X 250. 



Sargassum Liebmaimi J. Ag. 



Fig. 81. A segment showing the character of the stem, leaves, fruit, and 

 vesicles. X 2. 



Colpomenia sinuosa f. 



Figs. 82, 83. Cross-section showing unusually long gametangia. X 250. 



Fig. 84. Cross-sections. X 250'. 



Fig. 85. Cross-section showing paraphyses and enlarged at outer end. 

 X 250'. 



Fig. 86. Cross-section showing some gametangia divided. X 250. 



[762] 



