Puccinia durangensis
| Puccinia durangensis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia durangensis | ||||||||||||
| Cummins |
Puccinia durangensis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass Piptochaetium fimbriatum . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to Mexico .
features
Macroscopic features
Puccinia durangensis 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 durangensis 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 uredia of the fungus usually grow on the upper side of the host leaves. Their cinnamon - brown uredospores are 32–39 × 29–36 µm in size, spherical to broadly ovate and finely spiky. The parts of the species growing on the top of the leaves are black-brown, powdery and exposed early. The light chestnut brown teliospores are two-celled, usually broadly ovate to ellipsoidal and 34–42 × 20–26 µm in size. Their stem is colorless and up to 110 µm long.
distribution
The known distribution area of Puccinia durangensis only includes the type locality on Highway Mex 40 near Durango .
ecology
The host plant of Puccinia durangensis is Piptochaetium fimbriatum . 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 .