CEDOOONIE^E. 



247 



B 



329. The asexual reproduction of (Edogonieae 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, 0). 

 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- 

 dons it, to be for a time a zoospore 

 (Fig. 166, E}. This method of 

 formation of zoospores is 

 Braun called Rejuvenescence. (See with drawn 



> preparatory to escaping. B, es- 



1). 42.) cape of protoplasm and formation 



nnn nil i j ,L of a zoospore ; the hyaline por- 



330. 1 he Sexual reproduction tion of the latter is t-en to be lat- 



reproduc- 

 A, fracture 



lament and escape of the 

 protoplasm of the broken cell ; 

 nrVio-r the protoplasm in the whole cell 

 ' u below is seen to be somewhat 

 from the cell-wall, 



of the plants of this class is in 

 many respects closely allied to that 

 of Spliceroplea. The female organs 

 are in all cases developed in essen- 

 tially the same way, but the male 

 organs present a considerable diversity. 



oral. G, a ciliated and swimming 

 zoospore, thi- hyaline portion now 

 terminal. D, zoospore at rest, 

 and sending out root like pro- 



The female organ 



