PLATE LIX. 



FIGS. PAGE 



1-5. Cosmarium undulatum Corda. All x 400. 



I, 4, and 5, after Ralfs . . .148 

 6-7. C. undulatum var. minutum Wittr. 6, x 400 



(after Wittrock) ; 7, x 1280 (after Kaciborski) 149 

 8-10. C. undulatum var. Wollei West. 8 and 9, x 

 500 (after Wolle) ; 10, zygospore, x 400 

 (after Ralfs) .... 150 

 11-12. C. undulatum var. crenulatum (Nag.) Wittr. 



II, x 500; 12, x 600 (after Nageli) . 150 

 13-15. C. subundulatum Wille. 13, x 480 (after 



Wille); 14, x 600; 15, x 400 . . 151 



IQ-tf.C.fontigenum Nordst. 16, x 520; 17, x 500 



(after Norstedt) . . .147 



18-20. C. Cucumis (Corda) Ealfs. 18, x 400 (after 



Gay) ; 19 and 20, x 400 (after Ralfs) . 152 



21-22. C. Cucumis var. magnum Racib. 21, x 520; 



22, x 400 . . . 154 



