Uromyces elegans
| Uromyces elegans | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces elegans | ||||||||||||
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Uromyces elegans is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the legume Trifolium carolinianum . 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 southwestern United States .
features
Macroscopic features
Uromyces elegans 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 elegans grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia are not known. The aecia of the species growing on the underside of the host leaves are short and whitish. Their hyaline aeciospores are 17–19 × 14–18 µm in size, spherical to ellipsoidal and warty. The uredia of the fungus have not yet been observed. The uredospores are spiky. The parts of the species growing on both sides and on stems are dark cinnamon brown, powdery and uncovered. The golden to light chestnut brown teliospores are unicellular, usually spherical to long ellipsoid, warty and mostly 21–24 × 17–20 µm in size. Their stem is colorless.
distribution
The known distribution area of Uromyces elegans extends from South Carolina to Arkansas and Texas .
ecology
The host plant of Uromyces elegans is Trifolium carolinianum . 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 macrocyclical development cycle with Spermogonia, Aecien, Telien and Uredien. As a heterosexual parasite, it does not 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 .