CONFERVOIDE^:. 



209 



ously. When in an active state, their tubes are seen to 

 unite and twist about, just as if they were vegetable 

 worms ; but they grow like plants, and their manner of 

 increase is also vegetable. Disjointed algce are extremely 

 curious; they are characterised by their original or final 

 spontaneous separation into distinct fragments, which have 

 a common origin, but an individual life. They multiply 

 by spontaneous division, as represented in fig. 120, Nos. 6 



Fig. 120. 



1, Voivox globator. 2, A section of volvox, showing the ciliated margin of the 

 cell. 3, A portion more highly magnified, to show the young Volvicinite, with 

 their nuclei and filamentary attachments. 4, Spirog>/ra quinina, near which 

 , are spores in different stages of development. 5, Conferva floccosa, with cells 

 breaking np. 6, Stigeoclonium protensum, showing germinating zoospores. 

 7. Staurocarpus gracilis, cells dividing. 



and 7 ; and are generally found attached to the stems of 

 other plants immersed in water, or floating in pools or 

 ditches. 



