Uromyces epicampis
| Uromyces epicampis | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces epicampis | ||||||||||||
| Dietel & Holway |
Uromyces epicampis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of sweet grasses of the genus Muehlenbergia and the species Melica laxiflora . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in large parts of America.
features
Macroscopic features
Uromyces epicampis 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 epicampis grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The small, cinnamon-brown uredia of the fungus grow in rows on the underside of the host leaves. Their olive to cinnamon-brown uredospores are 17–21 × 16–18 µm in size, mostly spherical to broadly ellipsoidal and spiky. The parts of the species, mostly growing on the upper side of the leaves, are blackish, compact and uncovered early. The chestnut-brown teliospores are unicellular, usually ovoid to oblong and 28–32 × 22–25 µm in size. Their stalk is yellowish and up to 100 µm long.
distribution
The known distribution area of Uromyces epicampis extends from Chile and Ecuador to the southern USA .
ecology
The host plants of Uromyces epicampis are Melica laxiflora and various Muehlenbergia 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 goes through a development cycle of which only Telien and Uredien and their host are known; Spermogonia and aecia are so far unknown.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin et al. 1971, ISBN 3-540-05336-0 .