Uromyces brominus
| Uromyces brominus | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces brominus | ||||||||||||
| Gucevič |
Uromyces brominus is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass genus Bromus . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in the southern CIS countries.
features
Macroscopic features
Uromyces brominus 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 brominus 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 rust-brown uredia of the fungus grow on both sides of the host leaves. Its matt brown uredospores are 23–30 × 21–28 µm in size, mostly spherical in shape and spiky. The underside of the leaf growing parts of the species are shiny and sunk. The chestnut-brown teliospores are unicellular, usually ovate and 19–28.5 × 13.5–22.5 µm in size, sometimes they are furrowed. Their stem is up to 23 µm long.
distribution
The known distribution area of Uromyces brominus includes the south of the former USSR .
ecology
The host plants of Uromyces brominus are diverse Bromus 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 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 .