Puccinia neocoronata
| Puccinia neocoronata | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia neocoronata | ||||||||||||
| Greene & Cummins |
Puccinia neocoronata is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grasses Stipa pringlei and Piptochaetium fimbriatum . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in southern North America.
features
Macroscopic features
Puccinia neocoronata can only be recognized with the naked eye by 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 neocoronata 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 uredia of the fungus grow on both sides of the host's leaves. Its cinnamon-brown uredospores are egg-shaped, 28–36 × 23–26 µm in size and finely spiky. The parts of the species growing on both sides of leaves are blackish, powdery and uncovered early. The hazelnut-brown teliospores are two-celled, wedge-shaped to spindle-shaped ellipsoid and 37–46 × 17–23 µm in size. At the top they have a tip or finger-like extensions. Their stalk is yellowish and 20–40 µm long.
distribution
The known distribution area of Puccinia neocoronata extends from Arizona to northern Mexico .
ecology
The host plants of Puccinia neocoronata are Stipa pringlei and 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 et al. 1971, ISBN 3-540-05336-0 .