Puccinia torosa
| Puccinia torosa | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia torosa | ||||||||||||
| Towers |
Puccinia torosa is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass Arundo donax . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to South Africa .
features
Macroscopic features
Puccinia torosa 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 torosa 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 leaves of the host plant. Their golden brown uredospores are ellipsoidal to elongated, 29–35 × 19–23 µm in size and finely spiky. The parts of the species that grow on both sides of leaves and sheaths are blackish to chocolate brown, confluent and uncovered in the morning. The golden to light hazel-brown teliospores are two-celled, usually ellipsoidal and 50–64 × 22–28 µm in size. Their stalk is brownish and up to 150 µm long.
distribution
The known distribution area of Puccinia torosa only includes South Africa .
ecology
The host plant of Puccinia torosa is Arundo donax . 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 .