Uromyces striatus
| Uromyces striatus | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces striatus | ||||||||||||
| J. Schröt. |
Uromyces striatus is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of milkweed and the legume genera Medicago and Hosakia . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is spread all over the world.
features
Macroscopic features
Uromyces striatus can only be recognized with the naked eye by means of the spore beds protruding on the surface of the host. They grow in nests that appear as yellowish to brown spots and pustules on the leaf surfaces.
Microscopic features
The mycelium of Uromyces striatus growing as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Your spermogonia grow on the underside of the host leaves. The aecia of the species, which also grow underneath the leaves, are whitish. Their hyaline aeciospores are 14-25 × 11-20 µm in size, spherical to broadly ellipsoid and warty. The uredia of the fungus, mostly growing underneath the leaves, are cinnamon brown. The golden to light cinnamon-brown uredospores are 19–25 × 15–20 µm in size, spherical to broadly ellipsoidal and spiky. The parts of the species are dark brown, powdery and uncovered. The dark golden to light chestnut brown teliospores are unicellular, usually spherical to ellipsoidal, warty and usually 19-25 × 15-20 µm in size. Their stem is colorless.
distribution
The known distribution area of Uromyces striatus includes the whole world.
ecology
The host plants of Uromyces striatus are for haplonts Wolf milks ( Euphorbia spp.) And for the dikaryotic various Medicago - and Hosakia species. The fungus feeds on the nutrients present in the storage tissue of the plants, its spore beds later break through the leaf surface and release spores. The species goes through a macrocyclical development cycle with Spermogonia, Aecien, Telien and Uredien. As a heterosexual parasite, it changes host .
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .