PLATE LXVIL 



FIGS. PAGE 



1-3. Cosmarium moniliforme (Turp.) Ralfs. 1 and 

 2, x 400 (after Ealfs) ; 3, zygospore, x 400 

 (after Lundell) . . .20 



4. C. moniliforme forma punctata Lagerh. x 520 22 

 5. C. moniliforme var. siibpyriforme West & G. S. 



West, x 520. . . =23 



6-7. C. moniliforme var. limneticnm West & G. S. 



West. ' x 520 . . . .23 



89. C. moniliforme forma paiidnriformis Heimerl. 



8, x 500 (after Heimerl) ; 9^ x 520 . 22 



10. C. moniliforme forma panduriformis Heimerl. 



Two specimens with punctate cell-wall, x 520 23 

 11-13. C. viride (Corda) Joshua forma glalra West & 

 G. S. West, 11, x 400; 12 and 13, x 500 

 (after Schmidle) . . .114 



14. C. alpestt-e Roy & Biss. x 400 (after Roy & 



Bissett) . . . .24 



15-17. C. connatum Breb. 15, x 520; 16, x 400 

 (after Ralfs) ; 17, basal view of semicell, x 

 400 . . . . . 25 



18. C. connatum var. truncatum West. x 400 . 26 

 19-21. C. pseudoconnatum Norclst, 19 and 20, x 400 



(after Nordstedt) ; 21, x 520 . . 26 



22. C. pseudoconnatum var. ellipsoideum West & 



G. S. West, x 520 . .28 



23. C. pseudoconnatum var. constrictum West, x 



400 29 



