PLATE LX. 



FIGS. PAGE 



1-3. Cosmarium Subcucumis Schmidle. 1, x 450 



(after Schmidle) ; 2 and 3, x 520 . . 155 



4. C. Subcucumis ? x 520. This individual 

 shows an intermediate condition between 

 axile and parietal chloroplasts . .156 



58. C. microsphinctum ISTordst. 5 and 6, x 400 

 (after Nordstedt) ; 6, zygospore ; 7 and 8, 

 x 520 . . . . 156 



9. C. microsphinctum foTm&parvulaWille. x 330 



(after Wille) .... 157 

 10. C. microspliinctum var. majus Roy & Biss. x 



400 (after Roy) . . .157 



11. C. morsum West, x 520 . . . 157 



12-14. C. Pliaseolus Breb. 12, x 400 (after Ralfs) ; 

 13, x 400 ; 14, zygospore, x 500 (after 

 Wolle) . ' . . .158 



15. C. Phaseolus forma minor Boldt. x 520 . 159 



16-17. C. Phaseolus var. elevatum Nordst. 16, x 570 



(after Nordstedt) ; 17, x 520 . . 159 



18. C. tumidum Lund, x 400 (after Lundell) . 160 

 19. C. tumidum forma subrectangularis West & 



G. S. West, x 400 . . 161 



20. C. Trafalgaricum Wittr. x 400 (after Witt- 

 rock) .... 161 

 21-23. C. melanosporum Arch. 21 and 22, x 600 

 (after Roy) ; 23, x 520 ; 22 and 23, zygo- 

 spores . . . .162 

 24-25. C. a&phserosporum Nordst. x 570 (after 

 Nordstedt). 25, zygospore (z, front view; 

 2', end view; z' ', side view) . .163 

 26-27. C. aspJiserosporum var. strigosum Nordst. 26, 



x 600 (after Nordstedt) ; 27, x 520 . 164 



