NEW DISEASE OF POTATOES. 3. Potato stems with sclerotia of Peziza postuma, B. and Wils. Natural size 4. Sclerotium of Peziza postuma, B. and Wils., × 2 6. Peziza postuma, B. and Wils. Natural size 7. Section through cap of Peziza postuma, B. and Wils. Enlarged 10 and 20 diameters 26 8. Section through fragment of cap of Peziza postuma, B. and Wils., × 400 27 9. Asci, paraphysis, and sporidia of Peziza postuma, B. and Wils., x 500. FUSISPORIUM DISEASE OF POTATOES. 27 11. Spores of Fusisporium Solani, Mart., in different stages of growth, × 1000 33 NEW DISEASE OF ONIONS. 12. Puccinia mixta, Fl., on flower scape of chives, x5 13. Section through a sorus of Puccinia mixta, Fl., × 200 14. Teleutospores of Puccinia mixta, Fl., × 1000 b 40 41 42 MILDEW OF ONIONS. FIG. 15. Peronospora Schleideniana, Ung., x 200; resting-spores, × 400; conidium, × 1000 16. Peronospora Schleideniana, Ung., part of conidiophore and conidia, × 400 NEW DISEASE OF GRASS. 17. Panicle of sheep's fescue grass invaded by Isaria fuciformis, Berk., × 2 18. Stems of sheep's fescue grass, with Isaria fuciformis, Berk, x5 19. Tip of one of the minor branches of Isaria fuciformis, Berk., × 100 20. Tip of branchlet of Isaria fuciformis, Berk., × 1000 21. Living wasp, with fungus growths, × 2 22. Torrubia ophioglossoides, Tul.; parasitic on Elaphomyces variegatus, Vitt. Natural size, and × 5, 200, and 1000 23. Mnium hornum, Hedw., invaded by mycelium of STRAW BLIGHT. 25. Fragments of diseased wheat stems, × 5 PAGE 26. Fragment of wheat stem with fungus growth, × 200 . 71 28. Spore of Oidium Balsamii, Mont., germinating on fragment of turnip leaf, x 1000 78 29. Peronospora parasitica, Pers., × 200 parasitica, Pers., × 1000 PUTREFACTIVE MILDEW OF TURNIPS AND CABBAGES. 30. Conidium and part of conidiophore of Peronospora 31. Oospores or resting-spores of Peronospora parasitica, Pers., x 400 81 83 84 |