PLATE 7 



Arthrospira ireviartiGulata S. and G. 



Fig. 26. An individual showing the general characters of a plant taken at 

 random. 



BrachytricMa ajfinis S. and G. 



Fig. 27. A section view through the cortex of a young thallus showing the 

 characteristic method of branching, and young hairs. X 330. 



Fig. 28. A section view through an old thallus showing true branches spring- 

 ing directly from the main filaments without the formation of loops. X 330. 



Symploca funicularis S. and G. 



Fig. 29. Portion of a single filament showing the characters particularly of 

 the terminal cell. X 330. 



Pleurocapsa entophysaloides S. and G. 



Fig. 30. Showing the characteristic manner in which the groups of colonies 

 arrange themselves in the stratum, after the manner of Entophysalis. 



This plate is a reprint of Gardner, Univ. Calif. Publ. Bot., vol. 6, p. 486, pi. 41, 

 1918. 



[136] 



