PLATE 41 



Streblonema pacificum Saunders 



Fig. 53. Plants in various stage of development creeping among the 

 sporangia of the host, with gametangia projecting beyond the host. X 250. 



Hapterophycus canalictilatus S. and G. 

 Fig. 54. Section of the thallus through a cryptostoma highly magnified. 



Sargassum Agardhianum Farlow 

 Fig. 55. Habit sketch of the end of a branch. X 1. 



Sargassum Palmeri Grunow. 



Fig. 56. Piece of a frond bearing a dissected leaf, a vesicle, and a group 

 of receptacles. X 1.5. 



Cliordaria dissessa S. and G. 



Fig. 57. Section perpendicular to the surface showing the character of the 

 cells, hairs, paraphyses, and zoosporangia. X 125. 



[754] 



