Uromyces airae-flexuosae
| Uromyces airae-flexuosae | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces airae-flexuosae | ||||||||||||
| Ferdinandsen & Winge |
Uromyces airae-flexuosae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass genus Deschampsia . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in large parts of Europe.
features
Macroscopic features
Uromyces airae-flexuosae can only be recognized with the naked eye by 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 Uromyces airae-flexuosae grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Aecia or spermogonia of the species are not known. The orange-yellow uredia of the fungus grow on the upper side of the host leaves. Its hyaline to yellowish uredospores are 23–26 × 21–23 µm in size, mostly broad ellipsoid and spiny. The teliae of the species growing on both sides and on sheaths are blackish and covered, they sometimes have few paraphyses. The golden to chestnut-brown teliospores are unicellular, usually ovate to oblong and 31–37 × 18–20 µm in size. Their stalk is yellowish and up to 40 µm long.
distribution
The known distribution area of Uromyces airae-flexuosae extends from western Russia to the British Isles .
ecology
The host plants of Uromyces airae-flexuosae are Deschampsia flexuosa and D. discolor . 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 .