Puccinia chisosensis
| Puccinia chisosensis | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Puccinia chisosensis | ||||||||||||
| Cummins |
Puccinia chisosensis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass Piptochaetum 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 chisosensis 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 chisosensis 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 top of the host's leaves. Their cinnamon-brown uredospores are usually ovate to broadly ellipsoidal, 26–30 × 20–24 µm in size and finely spiky. The mostly underside of the leaf growing parts of the species are black-brown and uncovered early. The hazelnut-brown teliospores of the fungus are two-celled, usually narrowly ovate to long ellipsoid and 36–50 × 16–21 µm in size. Their stalk is yellowish and up to 45 µm long.
distribution
The known distribution area of Puccinia chisosensis extends from Texas to San Luis Potosi and Zacatecas .
ecology
The host plant of Puccinia chisosensis is Piptochaetum 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 .