WISCONSIN PHYTOPLANKTON 193 



PLATE 8. 



Paga 



Fig. 1. Trichodcsmium lacustre (x 1000) 54 



Fig. 2. Anabaena plantonica (x 825) 55 



Fig. 3. Anabaena Bornetiana (x 825) 58 



Figs. 4-5. Anabaena Levanderi (x 825) 58 



Fig. 6. Anabaena macrospora var. robusta (x 825) 57 



Fig. 7. Anabaena affinis (x 825) 57 



Fig. 8. Anabaena limnetica (x 825) 



Figs. 9-10. Anabaena augstumalis var. marchica (x 825) 58 



13 



