. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 344 UREDINEAE. through the epidermis. The yellow uredospores are abjointed singly from long sporophores; they are unicellular and ovoid, with a thin granular coat beset with germ-pores (Fig. 184). The uredo- spores are easily conveyed to other grass-plants and germinate at once, their germ-tubes entering by a stoma and developing into a mycelium, which can produce a new crop of uredospores in a. Fig. 184.—Puccinia p
. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 344 UREDINEAE. through the epidermis. The yellow uredospores are abjointed singly from long sporophores; they are unicellular and ovoid, with a thin granular coat beset with germ-pores (Fig. 184). The uredo- spores are easily conveyed to other grass-plants and germinate at once, their germ-tubes entering by a stoma and developing into a mycelium, which can produce a new crop of uredospores in a. Fig. 184.—Puccinia praminis. A, Portion of transverse section of leaf of Serberis vulgaris, with a young aeciditim under the epidermis, u. I. Section through an aecidium-bearing spot of a Barberry leaf. At x the normal structure and thickness of the leaf is shown, the portion u to ?/ is abnormally thickened ; htoo, upper surface of the leaf ; sp, pycnidia ; a, aecidia in section ; p, their perldium. The .lecidium marked p alunc (without a) shows a peridium exposed in surface-view only. II. Mature teleutospore-patch breaking through the epidermis, c, from the tissue, b. of a leaf of Tritieum repens; (, teleutospores. x 190. III. Teleutospores, (, and uredosporesi ur. The teleutospore has a germ-pore at its apex, the uredospores have four germ-pores at their eqxiator. x 390. (After De Bary, from Sach's Lehrbuck.) few days. The uredospores are summer-spores, and spread the fungus during the vegetative period of the host-plant; they may, however, hibernate. The teleutospores are more suited for hibernation; they are produced in autumn from dark brown linear sori, distinguished from these of the uredospores by their darker colour and greater length. The teleutospores are two-celled and obovoid with smooth thick walls (Fig. 184); they are, like. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of thes
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
