(BDOGONIE^. 



247 



329. — The asexual reproduction of (Edogoniese 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 OTal 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, D), 

 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 what 

 Braun called Eejuvenescence. (See 

 p. 43.) 



330. 

 of the 



1 1 1 iTjixii. terminal. D. zoospore at rest, 

 many respects closely allied to that and sendlnir out root like pro. 



.of Sphwroplea. The female organs I^r^'^ou^nf °pTa,5?\X-ed™o'f 

 are in all cases developed in essen- es^inr x'm-Af'terP?iS|" 

 tially the same way, but the male ''^™- 



-organs present a considerable diversity. The female organ 



Pig. 166. — Asexnal reproduce 

 tion of (Edogonium. A, fracture 

 of a filament and escape of the 

 protoplasm of the broken cell ; 

 the protoplasm in the whole eel] 

 below is seen to be somewhat 

 withdrawn from the cell-wall, 

 preparatory lo escaping. £, es- 

 cape of protoplasm and formation 

 of a zoospore ; the hyaline por- 

 The sexual reproduction tlon of the latter is seen to be lat- 

 T , j» XT • 1 ■ • ^^^^- ^> 3, ciliated and swimming 



plants 01 this class is m zoospore, the hyaline portion now 



