Uromyces peglerae
| Uromyces peglerae | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces peglerae | ||||||||||||
| Pole Evans |
Uromyces peglerae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass genus Digitaria . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is spread pantropically .
features
Macroscopic features
Uromyces peglerae 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 peglerae 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 mainly on the upper side of the host leaves. Its golden to yellowish uredospores are 23–27 × 18–22 µm in size, usually broadly ellipsoidal and spiky. The bilateral growing parts of the species are black-brown and covered, they have few golden paraphyses. The chestnut-brown teliospores are unicellular, usually angular ovoid and 25–30 × 17–20 µm in size. Their stem is colorless to brownish and up to 60 µm long.
distribution
The known distribution area of Uromyces peglerae includes the tropics of Africa, South America and Asia.
ecology
The host plants of Uromyces peglerae are various fingergrass ( Digitaria spp.). 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 .