PLATE 40 



DictyosipJion foeniculaceus (Huds.) Grev. 



Fig. 47. Habit sketch of a terminal portion of a frond. X 2. 



rig. 48. Tip of a branch showing the character of the surface and hairs. 

 X 125. 



Fig. 49. Portion of a cross-section of a frond showing the character of the 

 cells, the base of a hair, and a zoosporangium. X 250. 



Myelophycus intestinalis f . tenue S. and G. 



. Fig. 50. Cross section of a frond showing zoosporangia and paraphyses. 

 X 250. 



Myrionema strangulans Grev. 

 Fig. 51. Basal filaments bearing erect filaments and zoosporangia. X 250. 



Leathesia difformis (L.) Aresch. 



Fig. 52. A few surface filaments showing a hair, gametangia and "para- 

 physes," with large terminal cells filled with chromatophores. X 250. 



[752] 



