Puccinia trebouxii
| Puccinia trebouxii | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia trebouxii | ||||||||||||
| Sydow & Sydow |
Puccinia trebouxii is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass genus Melica . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is native to Central Asia .
features
Macroscopic features
Puccinia trebouxii 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 trebouxii 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 upper side of the host leaves and on the cladding tubes. Their yellow to golden brown uredospores are 28–35 × 24–28 µm in size, broadly ellipsoidal and finely spiky. The parts of the species that grow on the top of the leaves are black-brown and open early. The chestnut-brown teliospores are two-celled, usually ovate to ellipsoidal and 45–58 × 24–28 µm in size. Their stem is colorless to pale yellow and up to 110 µm long.
distribution
The known distribution area of Puccinia trebouxii includes the border region between Afghanistan , Iran , Uzbekistan and Tajikistan .
ecology
The host plants of Puccinia trebouxii are Melica canescens and M. cupanii . 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 .