Uromyces lapponicus
| Uromyces lapponicus | ||||||||||||
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| Uromyces lapponicus | ||||||||||||
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Uromyces lapponicus is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the legume genera Astragalus and Oxytropis . 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 lapponicus 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 lapponicus grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow systemically on the hosts. The aecia of the species growing between them are whitish and cup-shaped. Their hyaline aeciospores are 21-25 × 16-20 µm in size, spherical to ellipsoidal and warty. The fungus lacks uredia . The golden to light cinnamon-brown uredospores are 19–25 × 15–20 µm in size, spherical to broadly ellipsoidal and spiky. The parts of the species growing underneath the leaves are cinnamon-brown, powdery and uncovered. The cinnamon to golden brown teliospores are unicellular, usually spherical to broadly ellipsoidal and mostly 24–28 × 19–22 µm in size. Their stem is colorless.
distribution
The known distribution area of Uromyces lapponicus includes the boreal and subboreal northern hemisphere.
ecology
The host plants of Uromyces lapponicus are various Astragalus and Oxytropis 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 microcyclic development cycle with spermogonia, aecia and telia. 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 .