EXPLANATION OF PLATE. 
337 
Fig. 4. Pustule of the same, enlarged. 
„ 5. Spores,' further magnified. 
„ 6. Flax Rust (. Lecythea Lint), on leaves of purging flax (. Linum 
catharticum). 
„ 7. Pustule of the same, enlarged. 
„ 8. Spores, further magnified. 
„ 9. Buttercup Smut (. Polycystis pompholygodes), on leaf and petiole of 
creeping buttercup (. Ranunculus repens). 
„ 10. Spores of the same, magnified. 
„ 11. Violet Smut {Polycystis Violte), on leaf and petiole of sweet violet 
{Viola odorata). 
„ 12. Spores of the same, magnified. 
„ 13. Rye-leaf Smut {Polycystis parallela), on leaf of rye {Secale cereale). 
„ 14. Spores of the same, magnified. 
„ 15. White Rust {Gystopus candidus ), on fragment of cabbage-leaf. 
„ 16. White Rust {Gystopus candidus ), on fruit of shepherd’s-purse 
{Gapsella bursa-pastoris). 
„ 17. Spores of white rust, magnified. 
„ 18. Poplar Rust {Melampsora populina), on portion of poplar leaf 
{Populus nigra). 
„ 19. Spores of the same, magnified. 
„ 20. Birch Rust {Melampsora betulina ), on decaying leaf of the common 
birch {Betula alba). 
„ 21. Spores of the same, magnified. 
„ 22. Spurge Rust {Melampsora Euphorbias ), on leaves of common spurge 
(. Euphorbia peplus). 
„ 23. Spores of the same, magnified. 
„ 24. Group of spores of the Birch Rust {Melampsora betulina), in active 
germination {Tulasne). 
