. 29 



bright-green discs, adhering firmly to the stems and floating 

 leaves of water lilies and other aquatics. In aquaria they 

 sometimes attach themselves in large numbers to the glass 

 sides of the vessel. 



Growing from the upper surface are numerous hairs, consisting of a 

 short, sheath-like base, including a very long and delicate filament (Fig. 

 17, J9). In their methods of reproduction they resemble CEdogonium, 

 but the reproductive organs are more specialized. 



