Puccinia digitariae-velutinae
| Puccinia digitariae-velutinae | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Puccinia digitariae-velutinae | ||||||||||||
| Viennot-Bourgin |
Puccinia digitariae-velutinae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the finger millet Digitaria velutina . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in tropical Africa .
features
Macroscopic features
Puccinia digitariae-velutinae 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 digitariae-velutinae 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 of the fungus grow on the underside of the leaf surfaces of the host plant and are yellowish-brown. Their golden or light cinnamon - brown uredospores are oval to egg-shaped, 25–32 × 20–25 µm in size and finely spiky. The black-brown parts of the species are uncovered early and compact. The deep golden to hazel-brown teliospores are two-celled, usually club-shaped to long-clubbed and 39–50 × 17–22 µm in size; their stem is golden and up to 25 µm long.
distribution
The known distribution area of Puccinia digitariae-velutinae includes tropical Africa from the Ivory Coast to Zambia .
ecology
The host plant of Puccinia digitariae-velutinae is the fingergrass Digitaria velutina . 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 .