Puccinia digna
| Puccinia digna | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia digna | ||||||||||||
| Arthur & Holway |
Puccinia digna is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of sweet grasses of the Stipaeae tribe . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in South and Central America.
features
Macroscopic features
Puccinia digna 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 digna 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 uredia are cinnamon brown and grow on the upper leaf surfaces of the host. Their yellow to golden uredospores are usually broadly ellipsoidal, 26–30 × 23–26 µm in size and finely spiky. The parts that grow on the top of the leaves are black-brown, uncovered early and compact. The hazel-brown teliospores are two-celled, usually ellipsoidal to broadly ellipsoidal and 36–46 × 23–26 µm in size; their stem is hyaline to golden and up to 130 µm long.
distribution
The known distribution area of Puccinia digna extends from Chile to Mexico .
ecology
The host plants of Puccinia digna are Stipa ichu , S. neesiana , Nassella chilensis and N. pubiflora . 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 .