70 A TEXTBOOK OF THEORETICAL BOTANY 



Reproduction 



Asexual reproduction takes place by the formation of daughter colonies 

 within special cells of the parent colony, which are recognizable by their 

 greatly increased size and are called gonidia (Fig. 47). By repeated cell 

 divisions the gonidia produce hollow, spherical colonies, which project into 



Fig. s°-~Volvox aureus. Diagram showing stages in the development of an asexual daughter 

 thS; ^W' ^T'^'"/" '!" the peripheral layer. B, C and D, Stages in the building up of 

 h1? "^It^^^^^ colony by division of the gonidium. E and F, Stages in eversion. G, Mature 

 daughter colony fully everted. {After Zimmermann.) 



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