Puccinia mellea
| Puccinia mellea | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia mellea | ||||||||||||
| Dietel & Neger |
Puccinia mellea is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass genus Vulpia . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in southern South America .
features
Macroscopic features
Puccinia mellea 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 mellea 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 upper side of the leaf surfaces of the host plant and are yellowish brown. Their light yellow uredospores are broadly ellipsoidal, 25–32 × 20–24 µm in size and finely spiky. The parts of the species that grow on the upper side are covered and compact. The light golden teliospores are two-celled, usually club-cylindrical to cylindrical and 45–85 × 12–18 µm in size; their stem is golden and up to 20 µm long.
distribution
The known distribution area of Puccinia mellea includes Chile and Argentina .
ecology
The host plants of Puccinia mellea are various Vulpia species. 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 .