. FiO. 29. Fio. 30. Fig. 20.—Cellular from diseased cotyledon of Beech. The starch-grains have been absorbed from the cell-protoplasm which has shrunk awaj- from the cell-wall a ; b, (>, intercellular fungal hyphae with very tiny haustoria ; c, c, fertilized oogonia, each containing a .single oospore. (After K. Hartig.) Fio. 30.—Phi/tojihlhora omnii-ora on the epidermis of a Beech-cotyledon, c. Outer wall of epidermal cell; li, cuticle; c, hyphae growing between cell-wall and cuticle, causing the shght protuberance d; e, spot where a hypha has emerged through the cuticle and develop
. FiO. 29. Fio. 30. Fig. 20.—Cellular from diseased cotyledon of Beech. The starch-grains have been absorbed from the cell-protoplasm which has shrunk awaj- from the cell-wall a ; b, (>, intercellular fungal hyphae with very tiny haustoria ; c, c, fertilized oogonia, each containing a .single oospore. (After K. Hartig.) Fio. 30.—Phi/tojihlhora omnii-ora on the epidermis of a Beech-cotyledon, c. Outer wall of epidermal cell; li, cuticle; c, hyphae growing between cell-wall and cuticle, causing the shght protuberance d; e, spot where a hypha has emerged through the cuticle and developed as a sporangiophore/; after the first sporangium has reached maturity a second begins to form, n atid h, whereby the first is displaced ; A-, a stoma from which sporangiophores have developed. (After R. Hartig.) only too well known. It attacks leaves, shoots, and tubers of potato and other Solanaceae, the tomato (S. Li/copersicum). The potato leaves become discoloured, brown-spotted, and crumpled, especially in damp weather. The sporangiophores (gonidiophores of De Bary) issue from tlie stomata in 1 De Bary, Journal of Botany, 1876, and Journal of the. Royal Agrir. Society, 1876.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
