Puccinia obliquoseptata
| Puccinia obliquoseptata | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia obliquoseptata | ||||||||||||
| Viennot-Bourgin |
Puccinia obliquoseptata is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of Olyra micrantha . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is native to South America.
features
Macroscopic features
Puccinia obliquoseptata 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 obliquoseptata 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 cinnamon-brown uredia grow on the underside of the host's leaves. Their yellowish or light brown uredospores are oval to ovate, 30–36 × 24–31 µm in size and finely spiky. The leaf underside parts of the species are chocolate brown, exposed early and compact. The golden to hazel-brown teliospores are two-celled, usually spindle-shaped to long ovoid and 28–40 × 15–20 µm in size; their stalk is hyaline and up to 60 µm long.
distribution
The known distribution area of Puccinia obliquoseptata includes Paraguay and Brazil .
ecology
The host plant of Puccinia obliquoseptata is Olyra micrantha . 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 B. Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .