Puccinia festucae-ovinae
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| Puccinia festucae-ovinae | ||||||||||||
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Puccinia festucae-ovinae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sheep fescue ( Festuca ovina ). Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to China .
features
Macroscopic features
Puccinia festucae-ovinae 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 festucae-ovinae 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 uredia and uredospores of the fungus. The parts of the species growing on both sides, but mostly on the upper side of the leaves, are black-brown, up to 0.8 mm long and powdery. The chestnut-brown teliospores are two-celled, ellipsoid to broadly ellipsoid and 28–43 × 12–20 µm in size. Their stem is colorless and up to 57 µm long.
distribution
The known distribution area of Puccinia festucae-ovinae only includes the Chinese Yunnan .
ecology
The host plant of Puccinia festucae-ovinae is the sheep fescue ( Festuca ovina ). 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 their host are known; Uredien, Spermogonia and Aecien 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 .