Puccinia cockerelliana
| Puccinia cockerelliana | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia cockerelliana | ||||||||||||
| Bethel |
Puccinia cockerelliana is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the meadow rue Thalictrum fendleri and fescue . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in North America .
features
Macroscopic features
Puccinia cockerelliana 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 cockerelliana grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The aecia of the species have 23–29 × 19–23 µm large, broadly ellipsoidal to spherical and hyaline- yellowish aeciospores. The yellow-brown uredia of the species grow on the upper side of the leaves of the host plant. Their yellow to almost colorless uredospores are usually broadly ellipsoidal to ovate, 27–32 × 22–25 µm in size and finely spiky. The parts of the species growing on the top of the leaves are brown and uncovered early. The golden-brown teliospores of the fungus are two-celled, usually long, cylindrical and 60–80 × 14–18 µm in size. Their stalk is brownish and up to 15 µm long.
distribution
The known distribution area of Puccinia cockerelliana extends from Alaska to New Mexico .
ecology
The host plants of Puccinia cockerelliana are for the haplont Thalictrum fendleri and fescue ( Festuca spp.) For the dikaryote . 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 has a development cycle with Telien, Uredien, Spermogonia and Aecien and changes host.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .