Puccinia cynodontis
| Puccinia cynodontis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia cynodontis | ||||||||||||
| Lacroix |
Puccinia cynodontis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass Cynodon dactylon and many other plant species. Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs worldwide in warm climates.
features
Macroscopic features
Puccinia cynodontis can only be recognized with the naked eye by means of 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 cynodontis grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The cylindrical aecia of the species have 15–24 × 16–29 µm large, hyaline aeciospores with a warty surface. The cinnamon-brown uredia of the fungus grow on the underside of the host leaves. Their golden uredospores are 20–26 × 19–23 µm in size, spherical and warty. The parts of the species growing underneath the leaves are blackish, powdery and exposed early. The chestnut-brown teliospores are two-celled, usually ellipsoid and 30–55 × 16–22 µm in size. Their stalk is yellowish to colorless and up to 80 µm long.
distribution
The known distribution area of Puccinia cynodontis extends over the warm climates of the whole world.
ecology
The host plants of Puccinia cynodontis are for the haploid Euphorbiaceae (spp Euphorbiaceae.) Plantain Family (Plantaginaceae spp.), Ranunculaceae (Ranunculaceae spp.), Saxifragaceae (Saxifragaceae spp.), Figworts (Scrophulariaceae spp.), Valerian plants (Valerianaceae spp.) and violet family (Violaceae spp.) and Cynodon dactylon 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, Aecien and Spermogonia and changes host.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .