Puccinia fraseri
| Puccinia fraseri | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia fraseri | ||||||||||||
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Puccinia fraseri is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is a endoparasite the Korbblütlergattung Hieracium . 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 fraseri 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 fraseri 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 same applies to the uredia of the fungus and their uredospores. The leaves of the species growing on the underside of the host leaves are bright yellow, compact and covered, they are in dense groups. The hyaline to slightly yellowish teliospores are two-celled, usually long ovoid to narrow ellipsoid and 36–46 × 16–20 µm in size. Their stem is colorless and up to 70 µm long.
distribution
The known distribution area of Puccinia fraseri extends from Nova Scotia and Pennsylvania to Québec and Montana .
ecology
The host plants of Puccinia fraseri are various Hieracium 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 their host are known; Uredien, 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 .