PLATE XXVII. 



FIGS. PAGE 



1-6. Docidium bacidwn Breb. 1, x 430; 2-6, 



x 520 ; 6, basal view of semicell, x 520 . 193 

 7-10. D.undulatumEiuL 7, x 430; 8 and 9, x 400; 



10, basal view of semicell, x 520 . . 194 



1 1 . -D. undulatum forma perundulata West & Gr. S. 



West, x 400. . . . 196 



12. D. undulatum var. dilatatum (Cleve) West & 



G. S. West, x 400 . . 196 



13-15. D. nobile (Kichter) Lund. 13 and 14, x 300 

 (after Richter) ; 15, base of semicell, x 510 

 (after Ricliter). - . .196 



16-18. Pleurotfenium voromitnm (Breb.) Rabenli. 16, 



x 220 ; 17 and 18, x 400 . . 199 



