Uromyces penniseti
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| Uromyces penniseti | ||||||||||||
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Uromyces penniseti is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass Pennisetum lanatum . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to Pakistan .
features
Macroscopic features
Uromyces penniseti 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 penniseti 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. Its golden to light cinnamon-brown uredospores are 25–30 × 19–22 µm in size, mostly ovate to ellipsoidal and spiky. The parts of the species growing underneath the leaves are black-brown, compact and exposed. The clear maroon teliospores are unicellular, usually ovoid to ellipsoid and 25–32 × 17–24 µm in size. Their stalk is brownish and up to 90 µm long.
distribution
The known distribution area of Uromyces penniseti only includes Pakistan .
ecology
The host plant of Uromyces penniseti is Pennisetum lanatum . 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 .