Uromyces schoenanthi
| Uromyces schoenanthi | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces schoenanthi | ||||||||||||
| Sydow & P. Sydow |
Uromyces schoenanthi is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grasses Apluda mutica , camel grass ( Cymbopogon schoenanthus ) and Polytrias amaura . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in eastern Asia .
features
Macroscopic features
Uromyces schoenanthi can only be recognized with the naked eye from 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 schoenanthi grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Aecia or spermogonia of the species are not known. The cinnamon-brown uredia of the fungus grow on the underside of the host leaves. Their cinnamon-brown to yellowish uredospores are 20–24 × 17–21 µm in size, mostly ovate to broadly ellipsoidal and spiky. The parts of the species growing underneath the leaves are black-brown, compact and exposed. The chestnut-brown teliospores are unicellular, usually ovate and angular and 22–26 × 17–26 µm in size. Their stalk is yellowish and up to 40 µm long.
distribution
The known distribution area of Uromyces schoenanthi extends from Sri Lanka via China and the Philippines to New Guinea .
ecology
The host plants of Uromyces schoenanthi are Apluda mutica , camel grass ( Cymbopogon schoenanthus ) and Polytrias amaura . 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 of which only Telien and Uredien and their host are known; Spermogonia and aecia could not be assigned to the fungus.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .