Xll EXPLANATION OF PLATES. 



FIG. 35. Gloeosporium Mezerei, C. & M. a, conidia x 400. 

 36. Phleospora Oxyacantha, Kze. a, conidia x 400. 

 37. Podosphcera Oxyacanthce, DC. a, tip of appendage enlarged, 

 3S.Raestelia lacerata, Mer. , section of cups, enlarged ; 6, aecidiospore 



x 400. 



39. Phyllosticta Cylisi, Desm. a, section of peritheciura ; 6, conidia x 400. 

 40* Baestelia cormita, Gmel. a, three cups, enlarged ; b, eecidiospores x 400. 

 41. Gymnosporangium Sabirue, Dicks. Pustule, nat. size ; a, teleutospores 



x 400. 



42. Gymnosporangium confusum, Plowr. Teleutospores germinating x 400. 

 43. Coryneum Berkeleyi, Cooke. a, section of receptacle ; b, conidia x 400. 

 44. Gymnosporangium clavariiforme, Jacq. Pustule, nat. size ; a, teleutospores 



x 400. 

 45. Gymnosporangium juniperinum, L. Pustules, nat. size; a, teleutospores 



x 400. 

 .Spliairella Taxi, Cooke. a, perithecium enlarged ; b, ascus and sporidia 



x 400. 



PLATES XIX., XX., XXI. 



PESTS FOREST TREES. 



FIG. 1. Phyllosticta Aceris, Sacc. a, section of perithecium enlarged ; 6, conidia 



x 400. 



2. Phleospora Aceris, Lib. a, section of perithecium ; 6, conidia x 400. 

 '6.Septoglceum Hartigianum, Sacc. a, twig with pustules; b, section of 



pustule ; c, conidia x 400. 



4. Botrytis depr&dans, Cooke. Portion of capitulum x 400. 

 5. Ehytisma acerinum, Fries. a, conidia ; 6, ascus and ascospores x 400. 

 6. Uncinula Aceris, DC. a, receptacle enlarged; 6, tip of appendage en- 

 larged ; c, ascus and ascospores x 400. 



7. Ehytisma punctatum, Fries. a, conidia; 6, ascus and ascospores x 400. 

 9. GlfKosporium nervisequum, Fckl. a, conidia x 400. 



10 Septoria Hippocastani, B. & Br. a, section of perithecium ; 6, sporules x 

 400. 



11. Stereum purpureum, Fries. a, basidium with spores x 400. 



12. Phleospora Ulmi, Fries. a, section of perithecium ; b, sporules x 400. 



13. Piggotia astroidea, Berk. a, conidia x 400. 



14. Phyllachora Ulmi, Fckl. a, section of stroma ; b, ascus and ascospores x 

 400. 



15. Septoria Fraxini, Desm. a, section of perithecium ; b, sporules x 400. 



16. Gloeosporium umbrinellum, B. & Br. Hyphae with conidia x 400. 



17. Microstoma album, Desm. Basidia and conidia x 400. 



18 Uredo Quercus, Brond. a, uredospores x 400. 



19. Stereum hirsutum, Fries. a, basidium with spores x 400. 



20. Stereum frustulosum, Fries. a, basidia with spores x 400. 



21. Diaporthe taleola, Sacc. a, pustules enlarged ; b, section of stroma ; c, 

 conidia ; d, ascus and ascospores x 400. ' 



22.Phytophthora omnivora, DBy. 



23. Gloeosporium Carpini, Desm. a, pustule enlarged ; b, conidia x 400. 



24. Gnomoniella fimlrriata, A. & S. a, section of perithecia enlarged; b, asco- 

 spores x 400. 



25. Phyllosticta betulina, Sacc. a, conidia x 400. 



26. Melampsora betulina, Pers. a, uredospores ; b, teleutospores ; c, teleuto- 

 spores germinating x 400. 



27. Dothidella betulina, Fries. a, section of stroma enlarged ; 6, ascospores x 

 400. 



28. Septoria Tilia, West. a, section of perithecium enlarged ; 6, conidia x 400. 



29. Septoria alnicola, Cooke. a, section of perithecium ; b, conidia x 400. 



30. Passalora bacilligera, Fres. a, hyphse with conidium ; b, conidia x 400. 



31. Septoria Populi, Desm. a, section of perithecium ; b, conidia x 400. 



32. Marsonia Populi, Lib. a, section of pustule; 6, conidia x 400. 



33. Gloeosporium Tremulce, Lib. a, section of pustule ; b, conidia x 400. 



34. Melampsora Tremulce, Tul. a, uredospores; b, teleutospores x 400. 



35. Melampsora cecidioides, DC. a, uredospores ; b, teleutospores x 400. 



36. Melampsora populina, Jacq. a, uredospores ; b, teleutospores x 400. 



37. Taphrina aurea, Fries. a, section of blister ; 6, ascus and spores; c, asco- 

 spores x 400. 



