Plate 46 



Figs. 1, 2. Chlorangium stentorinum (Ehrenb. ) Stein, x 500 



Fig. 3. Coelastrum scabrum Reinsch, x about 1000 (redrawn 



from Bohlin) 



Fig. 4. Lagerheimia citriformis var. paucispina Tiffany & Ahl- 



strom, X about 1000 (redrawn from Tiflany & Ahl- 

 strom ) 



Figs. 5, 6. Dispora crucigenioides Printz, x 700 



Fig. 7. Characium acuminatum A. Braun, x about 500 (re- 



drawn from Braun) 



Fig. 8. Ankistrodesmus Braunii ( Naeg. ) Brunnthaler, x 500 



Fig. 9. Desmatractum bipyramidatum (Chod.) Pascher, x 1500 



Fig. 10. Selenastrum minutum ( Naeg. ) Collins, x 1200 



Fig. 11. Lagerheimia quadriseta (Lamm.) G. M. Smith, x 600 



Fig. 12. Eremosphaera oocystoides Prescott, x 1250 



Fig. 13. Characium opercidum Ackley, x about 850 (redrawn 



from Ackley ) 



Fig. 14. Characium ornithocephalum A. Braun, x 650 



Figs. 15, 16. Excentrosphaera viridis Moore, x 500 



Figs. 17, 18. Asterococcus spinosus Prescott: 17, x 800; 18, x 600 



Fig. 19. Characium Debaryanum ( Reinsch ) DeToni, x 320 



Fig. 20. Chlamydomonas mucicola Schmidle, x about 200 (re- 



drawn from Schmidle ) 



Figs. 21, 21a Tetraedron quadratum (Reinsch) Hansgirg: 21, x 800; 



21a, X 400 

 Figs. 22, 23. Tetraedron duospinum Ackley 

 Figs. 24, 25. Scenedesmus perforatus Lemmermann, x 1250 

 Fig. 26. Stephanosphaera pluvialis Cohn, x 1000 



Fig. 27. Characium Rahenhorstii DeToni, x 750 



[752] 



