Puccinia posadensis
| Puccinia posadensis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia posadensis | ||||||||||||
| Saccardo & Trotter |
Puccinia posadensis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of Imperata cylindrica and Andropogon species. Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. Their distribution area extends from southern North America over the Caribbean to Argentina .
features
Macroscopic features
Puccinia posadensis 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 posadensis grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Aecien of the species are evidently absent. The golden brown or cinnamon brown uredia grow on both sides of the leaves of the host. Their cinnamon - brown uredospores are mostly ovate, 28–33 × 19–25 µm in size and finely spiky. The parts of the species are black-brown, exposed early and compact, they grow underneath the leaves. The hazelnut-brown teliospores are two-celled, usually long ovate and 36–50 × 17–20 µm in size; their stalk is brown and up to 20 µm long.
distribution
The known distribution area of Puccinia posadensis covers an area that extends from Argentina via Trinidad and Panama to the southern USA .
ecology
The host plants of Puccinia posadensis are Imperata cylindrica and various Andropogon 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 apparently has a development cycle with Telien and Uredien, which manages without change of host; Spermogonia and aecia are apparently absent.
literature
- George B. Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .