Plate 63 



Fig. 1. Scenedesmus Bernardii G. M. Smith, x 1000 (after 



Smith ) 



Fig. 2. Scenedesmus bijuga (Turp. ) Lagerheim, x 1000 



Figs. 3, 4. Scenedesmus bijuga var. alternans (Reinsch) Hans- 

 girg: 3, X 1000; 4 X 750 



Figs. 5, 6. Scenedesmus brasiliensis BohHn: 5, x 1000; 6, x 500 



Fig. 7. Scenedesmus bijuga (Turp.) Lagerheim, x 750 (after 



Smith) 



Figs. 8, 9. Scenedesmus dimorphus ( Turp. ) Kuetzing, x 1000 



Figs. 10, 11. Scenedesmus denticulatus Lagerheim, x 1000 ( 10, af- 

 ter Smith ) 



Fig. 12. Scenedesmus hystrix Lagerheim, x 1000 (after Smith) 



Fig. 13. Scenedesmus incrassatulus var. mononae G. M. Smith, 



X 1000 (redrawn from Tiffany) 



Fig. 14. Scenedesmus incrassatulus BohHn, x 750 (redrawn 



from Bohhn, ex Brunnthaler ) 



Scenedesmus longus Meyen, x 1000 



Scenedesmus obliquus (Turp.) Kuetzing, x 750 



Scenedesmus opoliensis P. Richter, x 750 



Scenedesmus opoliensis var. contacta Prescott, x 750 



Scenedesmus quadricauda var. quadrispina (Chod. ) 

 G. M. Smith, X 750 (after Smith) 



Scenedesmus quadricauda var. longispina (Chod.) G. 

 M. Smith, X 1000 (after Smith) 



Scenedesmus armatus var. major G. M. Smith, x 1000 

 ( after Smith ) 



Scenedesmus longus var, Naegelii (de Breb.) G. M. 

 Smith, X 500 



[786] 



