^z 



CHLOROPHYCEAE 



phase of the gametes is short, lasting about 24 hours, whilst the 

 zygote may also remain motile for i hour, although the first division 

 of the zygote usually takes place after several days' dormancy. 



J4 



8^ 



■\ 





D 



Fig. 39. Enter omorpha intestinalis i.flagelliformis. A, portion of plant. B, origin 

 of branch of same showing basal constriction. C, D, E, transverse sections from 

 near base, middle and apex of thallus. = outside, z = inside of tube. F, G, cells 

 of thallus. (Original.) 



Parthenogenetic development of gametes has been recorded for 

 E. clathrata, and this presumably results in new sexual plants. As 

 yet no evidence of relative sexuality has been found among the 

 gametes of this genus. 



