Uromyces psoraleae
| Uromyces psoraleae | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces psoraleae | ||||||||||||
| Peck |
Uromyces Psoraleae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the legume genus Psoralea . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common east of the Rocky Mountains .
features
Macroscopic features
Uromyces psoraleae 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 Psoraleae grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The spermogonia of the species grow on the underside of the host leaves. The aecia of the species growing between them are short and yellowish. Their aeciospores are 21–26 × 18–22 µm in size, broadly ellipsoidal to spherical and warty. Uredien are not developed by the species. The parts of the species growing mostly on the underside of the surfaces of the host leaves are yellow-brown, compact and uncovered. The light chestnut-brown teliospores are unicellular, usually egg-shaped to ellipsoid, warty and mostly 29–40 × 20–25 µm in size. Their stalk is hyaline and up to 65 µm long.
distribution
The known distribution area of Uromyces psoraleae extends from Saskatchewan via Idaho and Arizona to Nebraska .
ecology
The host plants of Uromyces psoraleae are different species of Psoralea . 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 microcyclical development cycle with spermogonia, aecia and teliae and 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 .