Plate 120 



Fig. 1. PAnahaena circinalis var. inacrospora (Wittr. ) DeToni, 



x600 (after Smith) 



Fig. 2. Anabaena fios-aquae var. Treleasii Bornet & Flahault, x 



1225 (after Smith) 



Figs. 3-5. Nostoc microscopicum Carmichael: 3, x 400; 4 and 5, 

 habit, X 2Vo 



Fig. 6. Nostoc muscorum C. A. Agardh, x 540 (after Fremy) 



Figs. 7, 8. Nostoc pruniforme C. A. Agardh: 7, x 750: 8, habit, x 214 



[900] 



