Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplants00tube Year: 1897 34-t UKEDINKAE. tlirougli the e})iderniis. 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
Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplants00tube Year: 1897 34-t UKEDINKAE. tlirougli the e})iderniis. 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. 18i.âPuccinia graminis. A, Portion of transvei-se section of leaf of Bcrberis vulgaris, with a young aecidinm under the epidermis, 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 p is abnormally thickened ; It to o, upper siirfaco of the leaf; sp, pyenidia ; a, aecidia , sectiu a peridinui (â \|»i-(-l in -u: 11. Matmv tl. i, . 1 in. TclcUlos',,. . '.', ;,ll at its apex, the urcdcsjH (After l)e Bary, from Sach's Lehrbuxh.) -â¢idium marked p alone (without «) shows ly. . mg through the epidermis, e, from the . t eleutospores. x 190. s, ii,i\ The teleutospore has a germ-poro ur gcnn-pores at their equator. x 390. 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 arc, like
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