PLATE 41 



Arthrospira breviarticulata Setchell and Gardner 



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

 at random. 



Brachytrichia affinis Setchell and Gardner 



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 

 springing directly from the main filaments without the formation of loops. 

 X 330. 



Symploca funicularis Setchell and Gardner 



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

 of the terminal cell. X 330. 



Pleurocapsd entophysaloides Setchell and Gardner. 



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

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



[486] 



