Puccinia polypogonis
| Puccinia polypogonis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia polypogonis | ||||||||||||
| Spegazzini |
Puccinia polypogonis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is a endoparasite of Polypogon - grasses . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in southern America and Africa.
features
Macroscopic features
Puccinia polypogonis 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 polypogonis 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 of the fungus usually grow on the underside of the host leaves. Their golden to cinnamon-brown uredospores are 24–28 × 22–26 µm in size, ovate to ellipsoidal and finely spiky. The parts of the species growing underneath the leaves are black-brown, powdery and exposed early. The deep golden brown teliospores are two-celled, broadly club-shaped to ellipsoid and 40–45 × 20–24 µm in size. Their stem is colorless to brownish and up to 70 µm long.
distribution
The known distribution area of Puccinia polypogonis includes South America and South Africa .
ecology
The host plants of Puccinia polypogonis are Polypogon chilensis , P. interruptus and P. monspeliensis . 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 et al. 1971, ISBN 3-540-05336-0 .