Puccinia eucomi
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| Puccinia eucomi | ||||||||||||
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Puccinia eucomi is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grasses Andropogon eucomus and A. huillensis . 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 eucomi 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 eucomi 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 yellow uredia of the species grow on both sides of the leaves of the host plants. Their hyaline to yellow - brown uredospores are mostly ovate, 27–33 × 24–27 µm in size and finely spiky. The branches growing on both sides are black-brown, uncovered early and powdery. The hazel-brown teliospores are two-celled, usually broadly ellipsoidal and 35–44 × 24–30 µm in size; its stem is yellowish to colorless and up to 100 µm long.
distribution
The known distribution area of Puccinia eucomi only includes South Africa .
ecology
The host plants of Puccinia eucomi are Andropogon eucomus and A. huillensis . 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 .