Puccinia gnaphaliicola
| Puccinia gnaphaliicola | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia gnaphaliicola | ||||||||||||
| Hennings |
Puccinia gnaphaliicola is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sunflower genera Facelis and Gnaphalium . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in America and Oceania .
features
Macroscopic features
Puccinia gnaphaliicola 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 gnaphaliicola grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia and aecia are unknown. The uredia of the fungus, which predominantly grow on the underside of the host leaves and stems, are cinnamon brown. Their yellow-brown uredospores are 22–25 × 21–24 µm in size, broadly ovate to spherical and spiky. The parts of the species that usually grow on the underside of the leaves and on stems are black-brown, compact and uncovered. The golden to clear maroon teliospores are two-celled, usually long ovate to long ellipsoid and 35–50 × 19–23 µm in size. Their stem is colorless and up to 65 µm long.
distribution
The known distribution area of Puccinia gnaphaliicola extends from South America to the southeastern USA and also includes Australia and New Zealand .
ecology
The host plants of Puccinia gnaphaliicola are Facelis retusa and various Gnaphalium 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 goes through a development cycle of which only Telien and Uredien and their host are known so far; Spermogonia and Aecien could not be assigned to her.
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .