64 



the cell lumen and when these young cells have reached a cer- 

 tain degree of maturity, branches begin to grow out from them 

 again. This action can be repeated several times, the plant in 



Fig. 47. bi'phonodadus tropicus (Crouan) J. Ag. 

 a h c different stages of cell division; d, young branches begin to grow 

 out: e, summit of a branch growing out; /, transverse section of a rami- 

 fied filament with four branches, the fullv drawn branch is a zoosporangium). 

 [a, b, c, f, about 30:], d, e. 10 :1).- 



