Uromyces andropogonis
| Uromyces andropogonis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces andropogonis | ||||||||||||
| Tracy |
Uromyces andropogonis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of violets as well as of andropogon - sweet grasses . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in North America .
features
Macroscopic features
Uromyces andropogonis 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 andropogonis grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The aecia of the species have spherical and yellowish aeciospores with a warty surface, 12–19 × 12–19 µm in size. The yellow-brown uredia of the fungus grow on the underside of the host's leaves and sheaths. Their golden to dull cinnamon-brown uredospores are 16–19 × 14–17 µm in size, mostly spherical to ovoid and spiky. The parts of the species growing underneath the leaves are black-brown, compact and uncovered. The chestnut-brown teliospores are unicellular, usually ovoid to ellipsoid and 20–30 × 13–17 µm in size. Their stalk is yellowish to brownish and up to 70 µm long.
distribution
The known distribution area of Uromyces andropogonis includes the USA east of the Rocky Mountains .
ecology
The host plants of Uromyces andropogonis are for haplonts violets ( Viola spp.) And Andropogon TYPES for dikaryotic . 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, Aecien, Telien and Uredien and completes a host change .
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .