Uromyces dolicholi
| Uromyces dolicholi | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces dolicholi | ||||||||||||
| Arthur |
Uromyces dolicholi is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the legumes Cajanus indicus and Rhynchosia texana . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in subtropical and tropical America .
features
Macroscopic features
Uromyces dolicholi 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 dolicholi 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 predominantly grow on the underside of the surfaces of the host leaves, are cinnamon brown. Their cinnamon-brown uredospores are 21–26 × 18–22 µm in size, usually ovate to broadly ellipsoidal and spiny. The parts of the species, which usually grow on the underside of the surfaces of the host leaves, are cinnamon-brown, loosely to densely grouped, compact and uncovered. The bright golden teliospores are unicellular, usually narrow to elongated ellipsoid, warty and mostly 27–35 × 11–14 µm in size. The stem is hyaline and up to 30 µm long.
distribution
The known distribution area of Uromyces dolicholi extends from Texas and Florida over Central America and the Caribbean to South America .
ecology
The host plants of Uromyces dolicholi are Cajanus indicus and Rhynchosia texana . 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 .