Puccinia recedens
| Puccinia recedens | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia recedens | ||||||||||||
| Sydow & Sydow |
Puccinia recedens is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sunflower genus Senecio . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in northern North America .
features
Macroscopic features
Puccinia recedens 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 recedens grows as with all Puccinia intercellular types, and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia and aecia are unknown. The predominantly underside growing on the host leaves Telien the type are maroon, compact and uncovered, they are in dense, confluent groups. The golden to light cinnamon-brown teliospores are two-celled, usually long ovate to oblong and 36–48 × 14–18 µm in size. Their stalk is more or less colorless and up to 35 µm long.
distribution
The known distribution area of Puccinia recedens extends from the northern USA to Canada .
ecology
The host plants of Puccinia recedens different are Senecio ( Senecio spp.). 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 .