(EDOQONIEJE. 



247 



329. The asexual reproduction of CEdogonieae is as curi- 

 ous as the growth of its cells, just described. During the 

 early and active growth of the 

 plants the protoplasmic contents of 

 certain cells in a filament become 

 detached from their walls, and upon 

 the splitting of the latter the now 

 rounded protoplasm escapes as a 

 large zoospore (Fig. 166, A and 

 B] ; it is oval in shape, and provid- 

 ed with a crown of cilia about its 

 smaller hyaline end, by means of 

 which it swims rapidly hither and 

 thither in the water (Fig. 166, G). 

 After a time it comes to rest, 

 clothes itself with a cell-wall, and 

 sends out from its smaller end root- 

 like prolongations (Fig. 166, Z>), 

 which attach it to some object ; it 

 now elongates, and at length forms 

 partitions, taking on eventually the 

 form of the adult filament. It 

 sometimes happens that before the 

 new plant resulting from the 

 growth of a zoospore has formed its 

 first partition, the protoplasm sep- 

 arates from its wall and again aban- 



. . , . , . Fig. 166. Asexual reproduc- 



dons it, to be for a time a ZOOSpOre tion of (Edogonium. A, fracture 



/I?; ififi J?\ T'V.i'a TnQ^rv^ n f of a filament and escape of the 

 ^Jblg. lot), .Cr). iniS metnOQ 01 protoplasm of the broken ceil ; 



fnrmirirm of ynnsnorpq i<* whit the protoplasm in the whole cell 

 ZOOSpOies 18 WIlilU below is seen to be somewhtl 



Braun called Rejuvenescence. (See JJJS^ toTscX?n" Cel ?ei' 



T). 42. ^ ca P e ^ protoplasm and formatiou 



of a zoospore; the hyaline por-, 



330. The Sexual reproduction tion ol the latter is seen to be lat- 



, ,, , - , , . , . eral. C, a ciliated and swimming 



01 tile plants OI this ClaSS IS in zoospore, the hyaline portion now 



many respects closely allied to that 

 of Sphceroplea. The female organs 



nrp in nil r>aPS rlpvplnrWI in oacon. only one cell, with its protoplasm 



escaping. X 350.-After Prings- 



tially the same way, but the male heim - 



organs present a considerable diversity. The female organ 



