Uromyces aegopogonis
| Uromyces aegopogonis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces aegopogonis | ||||||||||||
| Dietel & Holway |
Uromyces aegopogonis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of water canisters and stevia as well as of aegopogon - sweet grasses . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to Mexico .
features
Macroscopic features
Uromyces aegopogonis can only be recognized with the naked eye by 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 aegopogonis 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 19–36 × 15–28 µm large, hyaline aeciospores with a warty surface. The yellow-brown uredia of the fungus grow on the underside of the host leaves. Their yellow to golden brown uredospores are 19–24 × 18–22 µm in size, mostly ovate to broadly ellipsoidal and spiny. The parts of the species growing underneath the leaves are black-brown, compact and uncovered early. The chestnut-brown teliospores are unicellular, usually spherical to broadly ovate and 24–28 × 21–27 µm in size. Their stem is colorless to brownish and up to 60 µm long.
distribution
The known distribution area of Uromyces aegopogonis only includes Mexico .
ecology
The host plants of Uromyces aegopogonis are for the haplont water doste ( Eupatorium spp.) And stevia ( Stevia spp.) As well as Aegopogon cenchroides , A. geminiflorus and A. gracilis 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 goes through 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 .