Uromyces imperfectus
| Uromyces imperfectus | ||||||||||||
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| Uromyces imperfectus | ||||||||||||
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Uromyces imperfectus is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of Bauhinia ( Bauhinia sp.). Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in Central and South America .
features
Macroscopic features
Uromyces imperfectus 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 imperfectus grows as with all Uromyces 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 mainly grow on the underside of the host leaves, are cinnamon brown. Their cinnamon-brown uredospores are 27–30 × 24–28 µm in size, mostly spherical and spiky. The parts of the species, which mainly grow underneath the leaves, are chocolate brown, uncovered and powdery. The chestnut-brown teliospores are unicellular, as a rule broadly ellipsoidal to spherical, warty and mostly 22–24 × 20–23 µm in size. Their stem is colorless.
distribution
The known distribution area of Uromyces imperfectus extends from South America to Nicaragua and Jamaica .
ecology
The host plants of Uromyces imperfectus are different Bauhinia 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 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 .