Puccinia chihuahuana
| Puccinia chihuahuana | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Puccinia chihuahuana | ||||||||||||
| Cummins |
Puccinia chihuahuana is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass Muhlenbergia fragilis . 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 chihuahuana can only be recognized with the naked eye from 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 chihuahuana 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 same applies to the uredia of the fungus. Their cinnamon-brown uredospores are 21–25 × 20–24 µm in size, mostly spherical and finely warty. The leaves of the species growing on the underside of the leaves and on stems are black-brown, powdery and exposed early. The chestnut-brown teliospores are two-celled, usually broadly ellipsoidal and 30–36 × 19–24 µm in size. Their stem is colorless and up to 90 µm long.
distribution
The known distribution area of Puccinia chihuahuana only includes Mexico .
ecology
The host plant of Puccinia chihuahuana is Muhlenbergia fragilis . 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 .