Puccinia advena
| Puccinia advena | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Puccinia advena | ||||||||||||
| Sydow |
Puccinia advena is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass Oplismenus africanus . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to South Africa .
features
Macroscopic features
Puccinia advena 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 advena 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-brown uredia of the species grow on the upper side of the leaves of the host plants. Their yellow - brown uredospores are ellipsoidal to spindle-shaped, 38–50 × 19–24 µm in size and finely spiky. The underside growing parts are black-brown, uncovered early and small. The hazelnut-brown teliospores are one to two-celled, usually ellipsoidal to ovate and 35–40 × 22–26 µm in size; their stalk is colorless and up to 100 µm long.
distribution
The known distribution area of Puccinia advena only includes South Africa .
ecology
The host plant of Puccinia advena is the sweet grass Oplismenus africanus . 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 .