Uromyces snowdeniae
| Uromyces snowdeniae | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces snowdeniae | ||||||||||||
| Cummins |
Uromyces snow deniae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass genus Snowdenia . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in eastern Africa.
features
Macroscopic features
Uromyces snowdeniae 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 snow deniae grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The spermogonia and aecia of the species are not known. The yellow uredia of the fungus grow on both sides of the host leaves. Its hyaline to pale yellow uredospores are 17–20 × 15–18 µm in size, mostly broad ellipsoid and spiky. The parts of the species are black-brown, powdery and uncovered early. The chestnut-brown teliospores are unicellular, usually ovoid to broadly ellipsoid, sometimes angular and 23–27 × 18–20 µm in size. The stem is colorless to yellowish and up to 45 µm long.
distribution
The known distribution area of Uromyces snowdeniae includes Kenya and Ethiopia .
ecology
The host plants of Uromyces snowdeniae are Snowdenia polystachya and S. scabra . 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 of which only Telien and Uredien and their host are known; Spermogonia and Aecien could not be assigned to her.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .