PLATE XXXVIII. 



FIG. PAGE 



1. Euastrumpictum~BoYg. x 555 (after Borgesen) 41 

 2. E. pictum forma, x 430 . . .42 



3-4. E. divaricatum Lund. 3, x 400 (after Lundell); 



4, x 520 . . .. .42 



5-8. .E. dubium Nag. 5 and 6, x 520; 7 and 8, x 430 43 

 9. E. dubium var. anglicanum (Turn.) West & Gr. S. 



West, x 500 (after Turner) . . 44 



10. E. dubium var. cambrense (Turn. )West & Gr. S. 



West, x 500 (after Turner) . . 45 



11. E. dubium var. Snowdoniense (Turn.) West & 



Gr. S. West, x 500 (after Turner) . 45 



12-13. E. erosum Lund. 12, x 400 (after Lundell) ; 



13, x 400 . . .45 



14_15._^. pukhellum Breb. 14, x 520; 15, x 430 . 46 

 16-21. E. elegans (Breb.) Kiitz. 16 and 18, x 430 ; 

 17, 19, and 20, x 520; 21, x 625; 18 and 19, 

 zygospores. Fig. 20 is an abnormal, much 

 rounded form . 48 



22-23. E. elegans var. pseudelegans (Turn.) West & 

 Gr. S. West. 22, x 500 (after Turner) ; 23, 

 x 520 . . . .49 



24-25. E. elegans var. Novse Semlise Wille. x 520 . 49 

 26. E. elegans var. ornatum West, x 520 . 50 



27. E. elegans var. ornithocepJialum (Benn.) West 



& Gr. S. West, x 400 (after Bennett) . 50 

 28-29. E. binale (Turp.) Ehrenb. x 520 . .51 



30. E. binale forma sect a Turn, x 400 . . 53 



31-32. E. binale forma Gutwinskii Schmidle. x 520; 



32, zygospore . . . .53 



33. E. binale forma hians West, x 400 . 53 



34. E. binale var. retusum West, x 520 . 54 



35. E. binale var. elobatum Lund, x 400 (after 



Lundell) . . . .54 



36. E. binale var. subelobatum West, x 400 . 55 



37. E. minutissimum West & Gr. S. West, x 500 



(after Turner) . . . .57 



