Puccinia imperatae
| Puccinia imperatae | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia imperatae | ||||||||||||
| Poirault |
Puccinia imperatae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of silver hair grass . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in the Mediterranean and South Africa .
features
Macroscopic features
Puccinia imperatae can only be recognized with the naked eye by 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 imperatae 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 yellow uredia of the species grow on both sides of the leaves of the host plants. Their hyaline to yellowish uredospores are spherical to ovate, 23–28 × 18–22 µm in size and finely spiky. The branches growing on both sides are black-brown, uncovered early and powdery. The golden to light hazel-brown teliospores are two-celled, usually ellipsoidal to long-ellipsoidal and 34–50 × 19–26 µm in size; its stem is colorless and up to 160 µm long.
distribution
The known distribution area of Puccinia imperatae includes South Africa and the Mediterranean area .
ecology
The host plant of Puccinia imperatae is the silver hair grass ( Imperata cylindrica ). 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 .