WISCONSIN PHYTOPLANETON 207 



PLATE 22. 



Page 



Fig. 1. Chlorella vulgaris (x 1000) 108 



Fig. 2. Trochiscia reticularis (x 1000) 109 



Fig. 3. Oocystis pusilla (x 1000) Ill 



Fig. 4. Oocystis Borgei (x 1000) Ill 



Fig. 5. Oocystis elliptica (x 1000) Ill 



Fig. 6. Oocystis parva (x 1000) 112 



Fig. 7. Oocystis gloeocystiformis (x 1000) 112 



Figs. 8-9. Oocystis lacustris (x 1000) 112 



Fig. 10. Oocystis submarina (x 1000) 113 



Fig. 11. Oocystis solitaria (x 1000) 113 



Figs. 12-13. Oocystis crassa (x 1000) 113 



