Puccinia poarum
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Puccinia poarum on a coltsfoot leaf |
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| Nielsen |
Puccinia Poarum is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sunflower family as well as of numerous sweet grasses . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. The species occurs in Eurasia and America .
features
_on_lower_surface_of_Coltsfoot.JPG)
Macroscopic features
Puccinia poarum can only be recognized with the naked eye by means of the spore beds emerging 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 Poarum grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The aecia of the species have 20–27 × 18–24 µm large, broadly ellipsoidal to spherical and hyaline- yellowish aeciospores. The light orange-yellow uredia of the species grow on the upper side of the leaves of the host plant. Their light yellow to almost colorless uredospores are usually ellipsoidal to ovate, 23–30 × 17–24 µm in size and finely spiky. The parts of the species growing underneath the leaves are long covered. The golden to hazelnut brown teliospores of the fungus are one to two-celled, usually long, cylindrical to ovoid and 40–58 × 17–25 µm in size. Their stalk is yellowish to colorless and up to 15 µm long.
distribution
The well-known distribution area of Puccinia poarum extends Europe through Asia and North America to South America.
ecology
The host plants of Puccinia poarum are for the haplonts daisy family (Asteraceae spp.) And sweet grasses (Poaceae spp.) 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 Telien, Uredien, Spermogonia and Aecien and changes host.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin et al. 1971, ISBN 3-540-05336-0 .
