xviii LIST OF ILLUSTRATIONS. 



MILDEW OF ONIONS. 



FIG. PAGE 



15. Peronospora Schleideniana, Ung., x 200 ; resting-spores, 



x400; conidmm, x 1000 46 



16. Peronospora Schleideniana, Ung., part of conidiophore 



and conidia, x 400 48 



NEW DISEASE OF GRASS. 



17. Panicle of sheep's fescue grass invaded by fsaria 



fuciformis, Berk., x 2 56 



18. Stems of sheep's fescue grass, with Isaria fuciformis, 



Berk, x5 57 



19. Tip of one of the minor branches of Isaria fuciformis, 



Berk., x 100 58 



20. Tip of branchlet of Isaria fuciformis, Berk., x 1000 58 



21. Living wasp, with fungus growths, x 2 . . .59 



22. Torrubia ophioglossoides, Tul. ; parasitic on Elapho- 



myces variegatus, Yitt. Natural size, and x 5, 200, 



and 1000 61 



23. Mnium hornum, Hedw., invaded by mycelium of 



Torrubia ophioglossoides, Tul. Natural size . . 64 



24. Parasite of Isaria fuciformis, Berk. ; Saprolegnia 



philomulces, W.Sm., x 400 68 



STRAW BLIGHT. 



25. Fragments of diseased wheat stems, x 5 . . .69 



26. Fragment of wheat stem with fungus growth, 



x200 71 



SURFACE MILDEW OF TURNIPS. 



27. Oidium Balsamii, Mont. , x 400 .... 77 



28. Spore of Oidium Balsamii, Mont., germinating on 



fragment of turnip leaf, x 1000 . . . . 78 



PUTREFACTIVE MILDEW OF TURNIPS AND CABBAGES. 



29. Peronospora parasitica, Pers., x 200 . . . 81 



30. Conidmm and part of conidiophore of Peronospora 



parasitica, Pers., x 1000 83 



31. Oospores or resting-spores of Peronospora parasitica, 



Pers., x400 84 



