Uromyces peckianus
| Uromyces peckianus | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces peckianus | ||||||||||||
| Farlow |
Uromyces peckianus is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the foxtail family and the sweet grass Distichlis spicata . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in North America .
features
Macroscopic features
Uromyces peckianus 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 Uromyces peckianus grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The cup-shaped or cylindrical aecia of the species have 18–20 × 16–18 µm large, light yellowish aeciospores with a warty surface. The yellow-brown uredia of the fungus grow on the upper side of the host leaves. Their yellow-brown uredospores are 18–24 × 18–24 µm in size, mostly spherical to pressed spherical and spiky. The parts of the species that grow on both or the upper side of the leaves are blackish, compact and uncovered early on. The chestnut-brown teliospores are unicellular, usually ovoid to ellipsoid and 24–36 × 20–26 µm in size. Their stalk is colorless to yellowish and up to 80 µm long.
distribution
The known range of Uromyces peckianus includes the east and west coast of temperate North America .
ecology
The host plants of Uromyces peckianus are for the Haplont foxtail family (Amaranthaceae spp.) And Distichlis spicata 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 goes through a development cycle with spermogonia, Aecien, Telien and Uredien and completes a host change .
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin et al. 1971, ISBN 3-540-05336-0 .