Puccinia nyasalandica
| Puccinia nyasalandica | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia nyasalandica | ||||||||||||
| Cummins |
Puccinia nyasalandica is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass Brachiara decumbens . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to Nyasaland .
features
Macroscopic features
Puccinia nyasalandica 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 nyasalandica 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 same applies to the uredia of the fungus. Their colorless uredospores are 19–21 × 14–18 µm in size, almost spherical to ovoid and finely spiky. The parts of the species that grow on the top of the leaves are up to 2 mm long, black-brown, powdery and open early; often they flow together. The golden-brown teliospores are two-celled, ellipsoidal to long-ellipsoidal and 30–38 × 17–20 µm in size. Their stem is colorless and up to 85 µm long.
distribution
The known distribution area of Puccinia nyasalandica only includes Malawi .
ecology
The host plant of Puccinia nyasalandica is Brachiara decumbens . 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 .