Puccinia pseudoatra
| Puccinia pseudoatra | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia pseudoatra | ||||||||||||
| Cummins |
Puccinia pseudoatra is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass genera Paspalum and Digitaria . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in South America .
features
Macroscopic features
Puccinia pseudoatra 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 pseudoatra grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Aecia or spermogonia of the species are not known. The light cinnamon-brown uredia of the mushroom grow on the underside of the host leaves. Their golden to cinnamon-brown uredospores are 21–25 × 20–24 µm in size, mostly spherical to broadly ellipsoidal and densely fine-waxy. The parts of the species growing underneath the leaves are black-brown and exposed early. The chestnut-brown teliospores are two-celled, usually broadly ellipsoid and 31–37 × 22–25 µm in size. Their stem is colorless and up to 90 µm long.
distribution
The known distribution area of Puccinia pseudoatra includes Bolivia , Peru , Argentina and Ecuador .
ecology
The host plants of Puccinia pseudoatra are Digitaria insularis and various Paspalum species. 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 of which only Telien and their host are known; Uredien, Spermogonia and Aecien could not be assigned to the fungus.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .