Uromyces hedysari-obscuri
| Uromyces hedysari-obscuri | ||||||||||||
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| Uromyces hedysari-obscuri | ||||||||||||
| ( DC ) Carestia & Picc. |
Uromyces Hedysari-obscuri is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the legume genus Hedysarum . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It iswidespread in the Holarctic .
features
Macroscopic features
Uromyces hedysari-obscuri 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 Hedysari-obscuri grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow predominantly on the underside along stems and leaf veins on the host leaves. The gregarious aecia of the species growing on the underside of the leaves and on the petioles are whitish and cup-shaped to short-cylindrical. Their hyaline aeciospores are 18–21 × 15–18 µm in size, spherical to broadly ellipsoidal and warty. The Uredia , mostly growing underneath the leaves, resemble the Aecia, also in their spores. The parts of the species growing on the top of the leaves are black-brown, powdery and uncovered. The chestnut-brown teliospores are unicellular, usually ovate to ellipsoidal, warty and mostly 21–27 × 16–18 µm in size. Their stem is colorless.
distribution
The known distribution area of Uromyces hedysari-obscuri is Holarctic, it extends from Utah and Colorado over Alaska to Europe .
ecology
The host plants of Uromyces hedysari-obscuri are various types of sweet clover . 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 development cycle with spermogonia, aecia and telia, but without uredia. As an auto-ecologic 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 .