152 



THE PLANT CELL. 



-gE^^^^'^^_»3„J^^;?S^g "S^g^ 



Fig. 110. — Reproduction in Vaucheria (Diagrammatic). — 1. Portion of a 

 filament of Vaucheria, with two protrusions arising near one another. 

 2. One of these protrusions has been converted into an antheridium 

 (the smaller one), the other into an oogonium, both being shut off 

 from the main filament by their walls. 3. The oosphere in the 

 oogonium has secreted a plug of mucilage, and antherozooids are 

 being attracted by this. 4. The resiilt of fusion of one of the anthe- 

 rozooids with the oosphere ; the oospore has assumed a, wall of 

 cellulose, and later will be freed from the oogonium by rupture 

 of the wall of the latter. 



