PLATE CLX. 



FIGS. PAGE 



1-3. Sphcerozosma excavatum Ralfs. 1* and 2*, x 510 ; 



3, zygospores, X 520 . . .211 



4-5. Sph. excavatum var. subquadratum W. & G. S. W. 



X 520 . . . . 212 



6-7 jS^. granulatum Roy & Biss. 6, x 520 ; 7*, X 810 213 

 8. Sph. granulatum var. trigranulatum W. & G. S. W. 



X 520 . . . . 214 



9. Sph. Wallichii Jacobs. X about 400 (after Wal- 



lich) . . . . .214 



10-11. Sph. Wallichii var. anglicum W. & G. S. W. 10, X 



520 ; 11, X 830 . . . . 215 



12*. Sph. vertebratum var. punctulatum West. X 510. 210 

 13-14. Onychonema filiforme (Ehr.) R. B. 13, X 400 ; 



14*, x 510 . . . 216 



15-16. 0. Iceve Nordst. 15, X 520 ; 16, aplanospore ?, 



X 520 . . . 218 



17. 0. Iceve var. micracanthum Nordst. Zygospore, x 



500 . . . . . 219 



18-19. Spondylosium pygmceum (Cooke) West, x 400 . 220 

 20-21. Sp. pygmceum var. monile (Turn.) W. & G. S. W. 

 20, X 450 ; 21, X ? (from a rough free-hand 

 drawing by Turner) . . .221 



22. Sp. pygmceum var. compressum West. X 400 . 221 

 23-25. Sp. planum (Wolle) W. & G. S. W. 23 and 24, x 



500 ; 25, x 1000 . 222 



