Uromyces poae
| Uromyces poae | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces poae | ||||||||||||
| Rabenhorst |
Uromyces poae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of buttercups and of various sweet grasses . 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 poae can only be recognized by the naked eye from 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 poae grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The socially growing aecia of the species have hyaline aeciospores 18–22 × 15–20 µm in size with a warty surface. The orange uredia of the fungus grow on both sides of the host leaves. Their golden-brown uredospores are 20-25 × 17-20 µm in size, mostly broadly ellipsoidal and spiky. The bilateral growing parts of the species are blackish and covered, they usually have numerous paraphyses. The golden to chestnut brown teliospores are unicellular, usually ovoid to long ellipsoid and 22–30 × 16–20 µm in size. Their stem is colorless to brownish and up to 40 µm long.
distribution
The known distribution area of Uromyces poae includes a Holarctic area.
ecology
The host plants of Uromyces poae are for the Haplont buttercup ( Ranunculus spp.) And Ficaria species as well as various sweet grasses of various genera for the dikaryotes . 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 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 .