Puccinia setariae-forbesianae
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| Puccinia setariae-forbesianae | ||||||||||||
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Puccinia setariae-forbesianae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the millet Setaria forbesiana . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to China .
features
Macroscopic features
Puccinia setariae-forbesianae 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 Puccinia setariae-forbesianae grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Aecia or spermogonia of the species are not known. The dark brown uredia of the species grow on both sides of the leaves of the host plants. Their yellow - brown uredospores are irregularly spherical to ovate, 27–31 × 20–24 µm in size and finely spiky. The telia are black-brown, long covered, then open like a slit. The hazelnut brown teliospores are one to two-celled, irregularly ellipsoidal to angular and 27–31 × 20–24 µm in size; their stem is short.
distribution
The known distribution area of Puccinia setariae-forbesianae only includes the Chinese Kunming .
ecology
The host plant of Puccinia setariae-forbesianae is the millet Setaria forbesiana . 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 .