PRINCIPAL GROUPS OF PLANTS. 



A mass of cells after numer- 

 ous divisions, all surrounded 

 by a mucilaginous envelope. 



GLOEOCAPSA. 



Single cell just after 

 division. The two 

 daughter cells re- 

 tained in a gelatinous 

 mass. Diameter 

 about 4 microns. 



A single colony. 



Diameter of colonies varying 



from 40 to 290 microns. 



Single cell showing 

 spiral chromatophore. 

 Length, 14 to 18 mi- 

 ll ROG LENA crons ' 



Heterocyst which divides the 

 filament into smaller filaments. 



Thick-walled resting cells. 



Spherical gelatinous masses 

 as found floating in/ponds. 

 About twice natural size. 



Filamentous colonies coiled 

 within the masses of jelly 



NOSTOC 



Part of a single filament. 

 Diameter, 4 to 12 microns. 



Diameter of filaments, 

 5 to 50 microns- 



Decaying cell 

 functioning as a heterocys 



Filaments, about 10 to 60 micron! 

 in diameter. 



LYNGBYA 



FIG. 6. Forms of Cyanophycese or Blue-Green Algae. Adapted from Engler and 



Prantl and somewhat modified by Lobeck. 



