Puccinia flavescens
| Puccinia flavescens | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia flavescens | ||||||||||||
| McAlpine |
Puccinia flavescens is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of feather grasses ( Stipa ). Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in Australia .
features
Macroscopic features
Puccinia flavescens 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 flavescens 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 usually grow on the upper side of the host leaves. Their golden to cinnamon-brown uredospores are 24–28 × 22–25 µm in size, ovate to ovate and finely spiky. The parts of the species that grow on the top of the leaves are blackish, powdery and open early. The dark maroon teliospores are two-celled, usually ellipsoidal and 38–46 × 22–25 µm in size. Their stalk is yellowish to brownish and up to 85 µm long.
distribution
The known distribution area of Puccinia flavescens covers large parts of Australia .
ecology
The host plants of Puccinia flavescens are Stipa flavescens and S. barbata . 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 .