Uromyces purus
| Uromyces purus | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Uromyces purus | ||||||||||||
| ( Syd. ) Cummins |
Uromyces purus is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Vernonia patens . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in Central America .
features
Macroscopic features
Uromyces purus can only be recognized by the naked eye from 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 purus grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow mainly on the upper side in small groups on the surface of the host leaves. The aecia of the species growing around them are scattered and cinnamon brown. The uredia of the fungus, which mainly grow on the underside of the leaves, are light yellow-brown. The uredospores, which are also cinnamon- brown, are 27–32 × 18–23 µm in size, ovate to broadly ellipsoid and spiky. The parts of the species growing underneath the leaves are whitish, compact and uncovered. The colorless teliospores are unicellular, usually ovoid to elongated, smooth and mostly 28–34 × 16–18 µm in size. Their stem is colorless and up to 30 µm long.
distribution
The known distribution area of Uromyces purus includes Mexico and Costa Rica .
ecology
The host plant of Uromyces purus is Vernonia patens . 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 macrocyclical development cycle with Spermogonia, Aecien, Telien and Uredien. As an auto-ecologic parasite, it does not change host .
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .