PLATE 49 

 Ectocarpus Parksii S. and G. 

 Fig. 15. Portions of a frond taken at different levels. X 250. 



Meneghiiiiella Brandegeei S. and G. 



Fig. 16. Portion of the surface of a frond showing cortical assimilating 

 filaments and gametangia. Highly magnified. 



Myriogloia Andersonii (Farlow) Kuckuck. 



Fig. 17. Segment of the surface of a filament showing stipitate zoo- 

 sporangia and irregularly clavate, uncinate assimilating filaments. X 375. 



Punctaria hesperia S. and G. 



Fig. 18. Sections of a sterile, and of a fruiting frond, respectively show- 

 ing protruding conical gametangia. X 250. 



Punctaria expansa S. and G. 

 Fig. 19. Section showing gametangia and hairs. X 250. 



[770] 



