PLATE LXXXVIL 



FIGS. PAGE 



1-2. -Cosmarium calcareum Wittr. 1, x 400 (after 

 Wittrock) ; 2, x 400. The lower semicell of 

 fioc. la. which was unfinished in Wittrock' s 



O * 



figure, has been utilized to show the single 



O ' O 



pyrenoid in the axile chloroplast . . 235 



3-5. C. subcostatum Nordst. 3 and 4, x 570 (after 



Nordstedt) ; 5, x 1000 . . . 236 



6-9. C. subcostatum forma minor West & G. S. West. 

 6 and 8, x 520; 1, x 1000; 9, form with 

 rectangular basal angles to the semicells, x 

 500. Note the single central pyrenoid in 

 each chloroplast in fig. 8a . . 238 



10-12. C. subcostatum var. Becldi (Gutw.) West & Gr. S. 

 AVest. 10a, x 750, and We, x 440; both 

 after Gutwinski. 11 and 12,, x 520. Again 

 note the single pyrenoid in each chloroplast 

 (fig. 11) . . . . 238 



13-16. C. costatum Nordst. 13 and 14, x 570 (after 



Nordstedt); 15, x 400; 16, x 520 . 239 



17. C. pntochondrwn W. & G. S. West. x 430 . 193 

 18. C. distichum Nordst. x 570 . .215 



19. C, quadratum Ralfs. x 500. Individual show- 

 ing the two normal pyrenoids in the chloro- 

 plast of the upper semicell, but three in that 

 of the lower semicell. [Compare PL LXX, 

 figs. 7-8.] . . . .57 



20. C. quadratum var. angustatum'W. & G. S. West. 



x 500 . . . . 59 



21-22. C. quadratum forma Willei nob. 21, x 500; 



22, x 400 (after Wille) . . .59 



