(EDOOONIE^. 



247 



329. — The asexual reproduction of CEdogouiese 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 (Pig. 166, C). 

 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. — The sexual reproduction 

 of the plants of this class is in 



Fig. 166. — Asexual reproduc- 

 tion of (Edogoniuni, A, fracture 

 of a filament and escape of the 

 protoplasm of the broken cell ; 

 the protoplasm, in the whole cell 

 below is seen to be somewhat 

 withdrawn from the cell-wall, 

 preparatory lo escaping. S, es- 

 cape of protoplasm and formation 

 of a zoospore; the hyaline por- 

 tion of the latter ia seen to be lat- 

 eral. O, a ciliated and swimming 

 zoospore, th« hyaline portion now 

 1 1 1 IT J 1. J.-L J. terminal. D. zoospore at rest, 

 many respects closely allied to that and sendlne out root-like pro- 

 of SpJKBToplea. The female organs ^^rT?o"u1.rpTan?VoLtTed"o'f 

 are in all cases developed in essen- e"8cIp?Sr'x"^^-Afrr'p?!Sg? 

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

 organs present a considerable diversity. The female organ 



