Puccinia gymnothrichis
| Puccinia gymnothrichis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia gymnothrichis | ||||||||||||
| Hennings |
Puccinia gymnothrichis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is a endoparasite the sweet grass - genus Gymnothrix . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in South America .
features
Macroscopic features
Puccinia gymnothrichis can only be recognized with the naked eye by means of the spore beds emerging 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 gymnothrichis 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 grow on both sides of the host's leaves. Their golden to cinnamon brown uredospores are mostly ellipsoidal to ovate, 26–32 × 22–26 µm in size and finely spiky. The bilateral growing parts of the species are black-brown and uncovered early. The hazelnut-brown to golden teliospores of the fungus are two-celled, usually ellipsoidal to narrow-ellipsoidal and 32–45 × 16–21 µm in size. Their stem is colorless and up to 80 µm long.
distribution
The well-known distribution area of Puccinia gymnothrichis extends from Ecuador via Argentina to Brazil .
ecology
The host plants of Puccinia gymnothrichis are various Gymnothrix species. 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 .