Plate 87 



Fig. 1. Phacus longicauda (Ehrenb.) Dujardin, x 750 



Fig. 2. Phacus pseudoswirenkoi Prescott, x 975 



Fig. 3. Phacus anacoelus var. undulata Skvortzow, x 675 



Figs. 4-6. Phacus Spirogyra var. maxima Prescott: 4, x 675; 5 and 

 6, X 750 



Figs. 7, 8. PJiacus anacoelus Stokes: 7, x 1125; 8, apical view 



Fig. 9. Phacus helikoides Pochmann, x 750 



Fig. 10. Phacus orbicularis Huebner, x 750 



Fig. 11. Phacus Birgei Prescott, x 750 



Fig. 12. Phacus orbicularis var. caudatus Skvortzow, x 900 



Fig. 13. Phacus caudatus Huebner, x 885 



Fig. 14. Phacus curvicauda Swirenko, x 900 



Figs. 15, 16. Phacus chloroplastes Prescott, x 900 



834 ] 



