Uromyces amphidymus
| Uromyces amphidymus | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces amphidymus | ||||||||||||
| Sydow & Sydow |
Uromyces amphidymus is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the glyceria genus . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in North America .
features
Macroscopic features
Uromyces amphidymus 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 Uromyces amphidymus 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 yellow-brown uredia of the fungus grow on both sides of the host leaves. Its golden to cinnamon-brown uredospores are 22–26 × 19–23 µm in size, mostly spherical to broadly ellipsoidal and spiky. The parts of the species are chocolate brown, compact and uncovered early. The deep golden to clear maroon teliospores are unicellular, usually ellipsoid and 21–34 × 16–20 µm in size. Their stem is brownish and up to 40 µm long.
distribution
The known distribution area of Uromyces amphidymus includes the eastern and central United States .
ecology
The host plants of Uromyces amphidymus are Glyceria acutiflora , G. borealis and G. septentrionalis . 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 .