Uromyces dactylidis
| Uromyces dactylidis | ||||||||||||
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Uromyces dactylidis |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces dactylidis | ||||||||||||
| GH Otth |
Uromyces dactylidis 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 is common in North America , Africa , Eurasia and New Zealand .
features
Macroscopic features
Uromyces dactylidis 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 dactylidis 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 yellow to cinnamon-brown uredia of the fungus grow on both sides of the host leaves and on the upper side on the fescue. Their golden-brown uredospores are 25–30 × 20–24 µm in size, mostly broadly ellipsoidal and spiky. The teliae of the species growing on both sides and on fescue are blackish and covered, which usually have numerous paraphyses. The chestnut-brown teliospores are unicellular, mostly angular 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 dactylidis includes a Holarctic area and New Zealand .
ecology
The host plants of Uromyces dactylidis are for the Haplont buttercup ( Ranunculus spp.) As well as various Festuca , Dactylis and Cynosurus species and rye ( Secale cereale ) for the dikaryote . 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 et al. 1971, ISBN 3-540-05336-0 .
