Uredo alpestris
| Uredo alpestris | ||||||||||||
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| Scientific name | ||||||||||||
| Uredo alpestris | ||||||||||||
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Uredo alpestris is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the two-flowered violet ( Viola biflora ). Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It iswidespread in the Palearctic . Since only its secondary crop shape is knownso far, it is classified in the genus Uredo .
features
Macroscopic features
Uredo alpestris 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 Uredo alpestris growing as with all Uredo TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The spermogonia and aecia of the species are not known. The uredia of the fungus growing on the underside of the host leaves are orange and initially covered. Their hyaline uredospores are 21–28 × 10–14 µm in size, usually broadly spindle-shaped to broadly ellipsoidal and smooth. The parts of the species are unknown.
distribution
The known distribution area of Uredo alpestris extends from Japan to Europe .
ecology
The host plant of Uredo alpestris is the two-flowered violet ( Viola biflora ). 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 presumably macrocyclical development cycle with Spermogonia, Aecien, Uredien and Telien. Due to the lack of aecia and spermogonia, it is not possible to determine whether it changes host .
literature
- Ernst Gäumann: The rust fungi of Central Europe. With special consideration of Switzerland . In: Contributions to the cryptogam flora in Switzerland . tape 12 . Commission publisher Buchdruckerei Büchler & Co, Bern 1959.