Puccinia Dochmia
| Puccinia Dochmia | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Puccinia Dochmia | ||||||||||||
| Berk. & MA Curtis |
Puccinia dochmia is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of Muhlenbergia - sweet grasses and Pereilema crinitum . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in Central America .
features
Macroscopic features
Puccinia Dochmia 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 dochmia 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 cinnamon-brown to yellowish uredia of the fungus grow on both sides of the host leaves. Their cinnamon-brown uredospores are 22–26 × 18–23 µm in size, broadly ellipsoidal to spherical and finely spiky. The parts of the species that grow on the sheaths and inflorescences as well as on both sides of the leaves are blackish, powdery and exposed early. The light hazelnut-brown teliospores are two-celled, often vertically septate, spherical to broadly ellipsoidal and 26–30 × 22–25 µm in size. Its stem is yellowish to colorless and up to 125 µm long.
distribution
The known distribution area of Puccinia Dochmia includes Mexico and the rest of Central America .
ecology
The host plants of Puccinia Dochmia are various Muhlenbergia species and Pereilema crinitum . 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 .