‖ uredo Bot.
(jʊˈriːdəʊ)
[L. ūrēdo (pl. ūrēdinēs) blight, blast, itch, f. L. ūrĕre to burn.]
1. A form of blight, = brand n. 7. rare.
| 1706 Phillips (ed. Kersey), Uredo, the blasting of Trees or Herbs. 1728 Chambers Cycl. s.v. Disease, Diseases of Plants... 9. Uredo, or Scorching, of which there are two Kinds. 1832 Lindley Introd. Bot. 299 Albigo, ferrugo, and uredo, commonly called mildew, smut, rust, brand, and other names, are diseases caused by the presence of myriads of minute fungi. |
2. A name for various fungi (popularly called
rust,
smut,
mildew, etc.) parasitic on grain and certain other plants; formerly regarded as a distinct genus, but now known to be only the intermediate stage of the
Uredineæ or rust fungi (
cf. uredospore). Usu. with capital.
| 1836 M. J. Berkeley Fungi 369 The specimens are referred by Klotzsch to Uredo. 1843 Penny Cycl. XXVI. 47/1 The wheat became attacked with Uredo. 1889 C. B. Plowright Brit. Uredineæ 125 The Uredo and Uromyces frequently attack the petioles. |
b. A species or plant of this.
| 1836 M. J. Berkeley Fungi 375 Elongated Uredo... Parallel Uredo. 1843 Penny Cycl. XXVI. 47/1 He diffused the granules of a Uredo in water. 1849 Lancet 17 Nov. 531/2 The uredo is studded all over with sharp points. 1889 Berwick. Nat. Club's Proc. XII. 488 A brown Uredo or Puccinia of the Common Mallow. |
c. A receptacle or hymenium in which uredo-spores are formed.
rare—1.
| 1879 Encycl. Brit. IX. 831/2 Again, in a few days, this mycelium forms a new kind of receptacle, the uredo. |
3. attrib., as
uredo-form,
uredo-patch;
uredo-fruit, a group of uredospores;
uredo stage, the summer stage of certain rust fungi.
| 1875 Bennett & Dyer tr. Sachs's Bot. 248 While the Fungus is multiplying..during the summer in its *uredo-form, the production of a new form of spores begins in the older *uredo-fruits. 1887 Bentley Man. Bot. (ed. 5) 380 These uredo-fruits consist of a dense mycelium [etc.]. |
| 1887 Hillhouse tr. Strasburger's Pract. Bot. 265 The haulm of an oat which is infected with rusty *uredo-patches. |
| 1880 Bessey Bot. 316 Later in the season..the *uredo stage begins to make its appearance..upon the leaves. 1895 M. C. Cooke Study Fungi xx. 246 In this group [sc. Pucciniopsis] of species the uredo stage is deficient. |