Uromyces graminicola
| Uromyces graminicola | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces graminicola | ||||||||||||
| Burrill |
Uromyces graminicola is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is a endoparasite of euphorbia and of Panicum - grasses . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in southern North America .
features
Macroscopic features
Uromyces graminicola 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 graminicola grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The aecia of the species have 20–32 × 16–23 µm large, hyaline aeciospores with a warty surface. The cinnamon-brown uredia of the fungus grow on both sides or predominantly on top of the host leaves. Their golden to cinnamon-brown uredospores are 20–25 × 15–23 µm in size, broadly ellipsoidal to spherical and spiky. The parts of the species are black-brown, powdery and exposed early. The deep golden to chestnut brown teliospores are unicellular, usually angular, ovoid to ellipsoid and 23–28 × 17–20 µm in size. Their stem is colorless to golden and up to 90 µm long.
distribution
The known distribution area of Uromyces graminicola extends from Honduras to the southern USA .
ecology
The host plants of Uromyces graminicola are for the Haplonten milkweed family (Euphorbiaceae spp.) As well as various Panicum species for the dikaryote . 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 has a development cycle with spermogonia, Aecien, Telien and Uredien and completes a host change .
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin et al. 1971, ISBN 3-540-05336-0 .