Puccinia silphii
| Puccinia silphii | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia silphii | ||||||||||||
| Schweinitz |
Puccinia silphii is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the composite family Silphium . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in eastern North America .
features
Macroscopic features
Puccinia silphii 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 silphii 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 parts of the species growing on the underside of the host leaves and stems are cinnamon to black-brown, compact and uncovered, they are in dense, confluent groups. The golden to light chestnut brown teliospores are two-celled, usually long ellipsoid and 35–50 × 13–18 µm in size. Their stem is light gold and up to 50 µm long.
distribution
The known distribution area of Puccinia silphii includes the temperate North America east of the Rocky Mountains and northward to Ontario .
ecology
The host plants of Puccinia silphii various Silphien 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 microcyclic development cycle without uredia , of which only Telia 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 .