Puccinia idonea
Puccinia idonea | ||||||||||||
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Systematics | ||||||||||||
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Scientific name | ||||||||||||
Puccinia idonea | ||||||||||||
Jackson & Holway |
Puccinia idonea is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Vernonia heydeana and Vernonia triflosculosa . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in Central America .
features
Macroscopic features
Puccinia idonea 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 idonea grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia and aecia are so far unknown. The yellow uredia of the fungus grow on both sides of the surface of the host leaves. Their hyaline uredospores are 23–28 × 18–21 µm in size, ovate to broadly ellipsoidal and spiky. The parts of the species growing underneath the leaves are black-brown and uncovered. The maroon teliospores are two-celled, warty and broadly ellipsoidal. Their stem is colorless and up to 90 µm long.
distribution
The known distribution area of Puccinia idonea extends from Guatemala to El Salvador .
ecology
The host plants of Puccinia idonea are the false asters Vernonia heydeana and V. triflosculosa . 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 goes through a macrocyclical development cycle with Spermogonia, Aecien, Telien and Uredien. As an auto-ecologic parasite, it does not change host .
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .