Puccinia pattersoniana
| Puccinia pattersoniana | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia pattersoniana | ||||||||||||
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Puccinia pattersoniana is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is a endoparasite of Brodiaea douglasii well as Agropyron - Elymus - and Sitanion - grasses . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in western North America .
features
Macroscopic features
Puccinia pattersoniana can only be recognized with the naked eye by means of the spore beds emerging 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 pattersoniana grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The aecia of the species, which grow in scattered points, have 23–28 × 19–22 µm large, broad ellipsoidal to spherical and hyaline- pale yellow aeciospores. The yellow-brown uredia of the species grow on the upper side of the leaves of the host plant. Their golden brown uredospores are usually broadly ovate, 29–33 × 21–25 µm in size and finely spiky. The parts of the species growing on the top of the leaves are light hazelnut brown, powdery and uncovered early. The golden to light hazel-brown teliospores of the fungus are two-celled, usually ellipsoidal and 32–38 × 18–21 µm in size. Their stalk is hyaline and up to 95 µm long.
distribution
The known distribution area of Puccinia pattersoniana includes the western United States and Canada .
ecology
The host plants of Puccinia pattersoniana are for haplonts Brouderiaea douglasii and Agropyron - Elymus - and Sitanion TYPES for dikaryotic . 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 .