Puccinia guaranitica
| Puccinia guaranitica | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia guaranitica | ||||||||||||
| Spegazzini |
Puccinia guaranitica is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass - genus Gouinia . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs from Central America to northern South America .
features
Macroscopic features
Puccinia guaranitica 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 guaranitica 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 (or lighter) uredia of the fungus grow on both sides of the host's leaves. Their light cinnamon-brown to yellow uredospores are usually broadly ellipsoidal to ovate, 20-25 × 17-21 µm in size and finely spiky. The bilateral growing parts of the species are black and uncovered early. The yellow to light golden brown teliospores of the species are two-celled, partly septate lengthways, broadly ellipsoid and 28–32 × 20–23 µm in size. Their stem is golden and up to 100 µm long.
distribution
The known distribution area of Puccinia guaranitica extends from Mexico to Bolivia and Paraguay .
ecology
The host plants of Puccinia guaranitica are different Gouinia species. 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 B. Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .