PLATE 15 



Chlorochytrium Porphyrae S. and G. 

 Fig. 1. A vertical section through the host, showing plants of the endophyte 

 in various stages of development and of embedding. X 140. 



Codiolum gregarium A. Br. 

 Fig. 2. A group of three plants. X 120. 



Derbesia marina (Lyng.) Kjellm. 



Fig. 3. A part of a filament showing the method of branching, and one 

 sporangium. X 65. 



Bryopsis corticulans Setehell 



Figs. 4, 5. Sketches shoAving origin and method of development of the corti- 

 cating filaments. X 25. 



Codium latum Suring. 



Fig. 6. Sketch of a single utricle showing the position of the sporangia and 

 of the hairs. X 100. 



Figure 1 is from Gardner, New Pac. Coast Mar. Alg. I, 1917, pp. 377-416, 

 pi. 32, fig. 6. 



[338] 



