Plate 109 



Fig. 1. Oscilhtoria acutissima Kufferath, x 750 



Figs. 2-4. Oscillatoria amoena ( Kuetz. ) Gomont, x 750 



Fig. 5. Oscillatoria angiistissima West & West, x 1500 



Fig. 6. Oscillatoria amphibia C. A. Agardh, x 900 



Fig. 7. Oscillatoria angusta Koppe: x 750; enlarged tiichome, 



x2000 



Figs. 8, 9. Oscillatoria chalyhea Mertens, x 750 



Figs. 10, 11. Oscillatoria formosa Bory: 10, x 900; 11, x 1500 



Figs. 12, 13. Oscillatoria granulata Gardner: 12, x 900; 13, x 900; 

 both drawn from a specimen in Farlow Herbarium 



Fig. 14. Oscillatoria Hamelii Fremy, x 750 



Fig. 15. Oscillatoria lacustris (Kleb.) Geitler, x 900 



Fig. 16. Oscillatoria limnetica Lemmermann, x 900 



Fig. 17. Oscillatoria limosa ( Roth ) C. A. Agardh, x 750 



Fig. 18. Oscillatoria nigra Vaucher, x 750 



[878] 



