Uromyces crotalariae
| Uromyces crotalariae | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces crotalariae | ||||||||||||
| ( Arthur ) JW Baxter |
Uromyces crotalariae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the legume genus Crotalaria . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in South and Central America as well as in South Africa.
features
Macroscopic features
Uromyces crotalariae 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 crotalariae grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The spermogonia and aecia of the species are unknown. The uredia of the fungus, which predominantly grow on the underside of the host leaves, are light cinnamon brown. Their yellowish to golden brown uredospores are 24–28 × 20–25 µm in size, mostly ovate to broadly ellipsoidal and spiky. The parts of the species growing underneath the leaf are black or chocolate brown and powdery. The colorless to cinnamon-brown teliospores are unicellular, usually frustoconical to broadly spherical, spiny and usually 20–32 × 20–30 µm in size. Their stalk is colorless and 12–22 µm long.
distribution
The known distribution area of Uromyces crotalariae includes Central to South America and South Africa .
ecology
The host plant of Uromyces crotalariae are different species of Crotalaria . 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 probably macrocyclical development cycle of which only uredia and telia and their host are known so far. It cannot therefore be said whether she will change host .
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .