Plate 77 



Fig. 1. Spirogyra mirabilis (Hass.) Kuetzing, x about 250 (re- 



dra\\Ti from Ackley ) 



Figs. 2, 3. Spirogyra porangabae Transeau, x 310 



Figs. 4-6. Spirogyra Collinsii (Lewis) Printz: 4, x 250; 5, x 325; 

 6, x 250 



Figs. 7, 8. Spirogyra Borgeana Transeau, x 285 



Fig. 9. Spirogyra Spreeiana Rabenhorst, x 280 



Fig. 10. Spirogyra faUax (Hansg. ) Wille, x 170 (redrawn from 



Hansgirg) 



Figs. 11—13. Basichdia crassa Hoffmann & Tilden, x 80 



[814] 



