Puccinia axiniphylli
| Puccinia axiniphylli | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Puccinia axiniphylli | ||||||||||||
| Arthur |
Puccinia axiniphylli is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Axiniphyllum tomentosum . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to Mexico .
features
Macroscopic features
Puccinia axiniphylli 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 axiniphylli 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 growing on the underside of the leaves are yellow and break out early. Their pale yellow uredospores are 24–31 × 22–24 µm in size, mostly ovate to spherical and spiny. The parts of the species growing underneath the leaves are blackish, compact and uncovered early on, they have golden paraphyses. The golden to clear maroon teliospores are two-celled, usually ovate to long ellipsoidal and 45–63 × 23–30 µm in size. Their stem is almost colorless and up to 70 µm long.
distribution
The known distribution area of Puccinia axiniphylli only includes southern Mexico .
ecology
The host plant of Puccinia axiniphylli is Axiniphyllum tomentosum . 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 .