Puccinia micrantha
| Puccinia micrantha | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia micrantha | ||||||||||||
| Griffiths |
Puccinia micrantha is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of currants and the sweet grass Oryzopsis micrantha . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to the United States .
features
Macroscopic features
Puccinia micrantha 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 Puccinia micrantha grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The aecia of the fungus have 20-25 × 16-22 µm in size, spherical to ellipsoidal, hyaline to pale yellowish aeciospores with a wrinkled surface. The cinnamon-brown uredia of the species mostly grow on the top of the leaves of the host plant. Their cinnamon-brown uredospores are usually broadly ellipsoidal to spherical, 18–23 × 17–20 µm in size and finely spiky. The parts of the species that usually grow on the upper side of the leaves are black-brown, powdery and exposed early. The brown teliospores of the fungus are two-celled, usually ovoid to ellipsoid and 36–48 × 20–26 µm in size. Their stalk is yellowish and up to 90 µm long.
distribution
The known distribution area of Puccinia micrantha extends from New Mexico to South Dakota and Nebraska .
ecology
The host plants of Puccinia micrantha are for haplonts currants ( Ribes spp.) And Oryzopsis micrantha 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 has a development cycle with Telien, Uredien, Spermogonia and Aecien and changes host.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .