PLATE XLIIL 



FIGS. PAGE 



1-2. Micrasterias Jenneri Ralfs. 1, x 400 ; 2, ver- 

 tical view, x 300 . . .86 

 3. M. Jenneri var. simplex West, x 400 . 88 

 4-8. M. conferta Lund. 4-6, x 200 (after Lundell) ; 

 7 and 8, x 520. Fig. 4 has not been well 

 executed, the lobulation being somewhat in- 

 exact . . . .88 

 9. M. conferta forma, x 520. This specimen is 

 intermediate between the typical form and 

 var. hamata . . . .90 

 10-11. M. conferta var. hamata Wolle. 10, x 520; 



11, larger specimen, x 430 . . 90 



