Uredo setariae-excurrens
| Uredo setariae-excurrens | ||||||||||||
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| Scientific name | ||||||||||||
| Uredo setariae-excurrens | ||||||||||||
| Wang |
Uredo setariae-excurrens is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass Setaria excurrens . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to China . Since only its secondary crop shape is knownso far, it is classified in the genus Uredo . Its teleomorph genus is probably Physopella or Phakopsora .
features
Macroscopic features
Uredo setariae-excurrens 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 setariae-excurrens grows 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 yellow-brown and have paraphyses . Their yellow-brown uredospores are 20–23 × 18–23 µm in size, mostly approximately ovoid to approximately spherical and spiny. The parts of the species are unknown.
distribution
The known distribution area of Uredo setariae-excurrens only includes Guizhou .
ecology
The host plant of Uredo setariae-excurrens is Setaria excurrens . 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
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .