Puccinia cesatii
| Puccinia cesatii | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia cesatii | ||||||||||||
| Schröter |
Puccinia cesatii is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite 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 Africa.
features
Macroscopic features
Puccinia cesatii 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 cesatii 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 chocolate- to yellow-brown uredia of the fungus grow on the underside of the host leaves. Their golden uredospores are 23–28 × 19–24 µm in size, spherical to broadly oval and finely wrinkled. The fungus sometimes forms 23–28 × 19–24 µm large amphispores that are similar to normal uredospores, but are chestnut brown. The leaves of the species growing underneath the leaves are chestnut brown, powdery and exposed early. The clear maroon teliospores are two-celled, usually broad ellipsoid and 32–38 × 24–27 µm in size. Their stem is brownish to hyaline and up to 80 µm long.
distribution
The known distribution area of Puccinia cesatii includes the central and southern Africa.
ecology
The host plants of Puccinia cesatii are species of the genera Bothriochloa , Capillipedium and Dichanthium . 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 Uredien and their host are known; Spermogonia and aecia 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 .