FRESH WATER ALG>C. 



PLATE XV. 



t 4zM 



4FTER NATURE SV OR H C WOOD 



SIMCLAiR ft SON. RHlLACfCt.f*HIA 



Fig 1 SPIROGYRA MAJUSCULA. 

 • I SPIROSYRA DILUTA 



F.g 3 SPIROGYRA SETIFORMIS 

 •• 4 SPIROGYRA CRASSA 

 " .S MESOCARPUS SCALAHIS 



Fig. 6. SPiROGVRA hNSIGNIS 

 •• ;. SPIROGYRA PARVISPORA 

 - S ZYCNEMA INSIGNfS. 



