PRINCIPAL GROUPS OF PLANTS. 



Single cell just after 

 division. The two 

 daughter cells re- 

 tamed in a gelatinous 

 mass. Diameter 

 about 4 m 



A single colony. 



Diameter of colonies varying Single cell showing 



from 40 to 290 microns. spiral chromatophore. 



Length. 14 to 18 mi- 



UROGLENA cronf - 



A mass of cells after numer- 

 ous divisiont, all surrounded 

 by a mucilaginous envelope. 



Heterocyst which divides the 

 filament into smaller filaments. 



Thick-walled resting cells. 



Filamentous colonies coiled 

 thin the masses of jelly 



Spherical gelatinous masses 

 as found floating in /ponds. 

 About twice natural size. 



Part of a single filament 

 Diameter. 4 to 12 microns. 



Diameter of filaments, 

 S to 50 microns* 



Decaymc cell 

 functioning as a het 



Filaments, about 10 to 60 micron* 



in diameter. 



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

 Prantl and somewhat modified by Lobeck. 



