133 



BOTANY. 



unite themselves directly into a new colony in the interior 

 of the parent-colony (Fig. 60). 



Class II. CEDOGOiaE^. 



276. The plants constituting this class are composed of 

 articulated, simple, or branched 

 ^--" filaments, which are attached to 

 sticks, stones, earth, or other ob- 

 jects by root-like projections of 

 the basal cells. The chlorophyll 

 in the cells is always dense and 

 uniform. They inhabit ponds and 

 slow streams, and form green 

 or brownish masses which fringe 

 the sticks and other objects in the 

 water. 



277. The asexual reproduction 

 of CEdogoniese is very curious. 

 During the early and active 

 growth of the plants the proto- 

 plasm of certain cells escapes as a 

 large zoospore (Fig. 61, A and B) ; 

 it is provided with a crown of 

 cilia about its smaller hyaline 

 end, by means of which it swims 

 rapidly hither and thither in the 

 water ( C). After a time it comes 



Fio. 61. — Asexual reproauc- 



tionofCEdogomum. ^.fracture to rest, clothes itself with a cell- 



of a fllament; B, escape of pro- 

 toplasm and formation of a zoS- ^all, and sends out from its small- 

 spore; C, swimming zodspore; ' 



?ut\°S?-uke pVoifnSsfrS^ er end root-like prolongations (i)), 

 X??otTosldoio?i;on';°c™e which attach it to some object; 



with its protoplasm escaping. 

 Hag:nified 350 times. 



it now elongates, and at length 



