THE ALGAE 



93 



entire plant has one continuous vacuole lined by cytoplasm and containing 

 numerous minute, round chloroplasts and nuclei. 



Fig. 73. — Bryopsis plwiiosa. Form of the whole plant. 



Vegetative propagation may be effected by the detachment of pinnae 

 which become plugged at the point of abstriction. These are able to develop 



Fig. 74. — Bryopsis pbimosa. Enlarged tip of thallus 

 showing the growing apex and the coenocytic 

 structure. 



new rhizoids and grow into fresh plants. It is interesting to note that in 

 conditions of dull light or when plants are placed upside down the apices of 

 the pinnae develop rhizoids. 



