Plate 108 



Gkiucocystis duplex Prescott, x 325 



Glaiicocystis Nostochineariim (Itz.) Rabenhorst, x 500 



Ghiiicocijstis oocystiformis Prescott, x 600 



Chamaesiphon confervicola A. Braun, x 330 (redrawn 

 from Kirchner, ex Fremy ) 



Chamaesiphon curvatus Nordstedt: 5, x 750; 6, x 600 



Chamaesiphon incrustans Grunow: 7 x 1000; 8, x 500 



Gloeochaete Wittrockiana Lagerheim, x 600 (drawn 

 from specimens collected in Michigan) 



Spinilina laxa G. M. Smith, x about 600 (after Smith) 



Spinilina major Kuetzing, x 1250 



Spinilina N ordstedtii Gomont, x 1000 



Spiridina princeps (West & West) G. S. West, x 700 



Spiridina subsalsa Oersted, x 850 



Oscillatoria Agardhii Gomont, x 600 



Oscillatoria curviceps C. A. Agardh, x 590 



Oscillatoria Bornetii Zukal: 19, x 750; 20, x 590 



Arthrospira Gomontiana Setchell, x 750 



Arthrospira Jenneri (Kuetz. ) Stizenberger: 22, x 500; 



23, X 375 



Fig. 24. Oscillatoria anguina (Bory) Gomont, x 590 



[876 



