Uromyces tenuicutis
| Uromyces tenuicutis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces tenuicutis | ||||||||||||
| McAlpine |
Uromyces tenuicutis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass genus Sporobolus . 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 tenuicutis 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 tenuicutis 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 yellow-brown uredia of the fungus grow on both sides or predominantly on the underside of the host leaves. Their (light) cinnamon-brown uredospores are 24–30 × 19–23 µm in size, broadly ellipsoidal and finely spiky. The parts of the species growing on the top of the leaves are grayish, inconspicuous and covered, they have paraphyses. The golden to chestnut brown teliospores are single-celled, variable and irregularly shaped and 22–28 × 16–23 µm in size. Their stem is colorless and up to 50 µm long.
distribution
The known range of Uromyces tenuicutis includes warm regions around the world.
ecology
The host plants of Uromyces tenuicutis are various Sporobolus 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 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 .