PLATE XCVII. 



PIGS. PAGE 



1. Cosmarium Botrytis Meuegh. var. subtumidum 



Wittr. x 400 (after Wittrock) . . 4 



2-3. C, Botrytis var. tumidum Wolle. x 500 . 5 



4. C. Botryt/is var. gemmiferum (Breb.) Nordst. 



x 500 . . . .6 



5. C. Botrytis var. mediol&ve West, a and b, x 400 ; 



a', x 500 . . . .6 



6. C. Botrytis var. depressum W. & Gr. S. West. 



x 430 . " . . .7 



7-8. C. controversial West. 7, x 520; 8, x 430 . 9 

 9-11. C. tuberculatum Arch. 9 and 10_, x 400 (after 



Archer); 11, x 400 . . .42 



