Uromyces columbianus
| Uromyces columbianus | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Uromyces columbianus | ||||||||||||
| Mayor |
Uromyces columbianus is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is a endoparasite the Korbblütlergattung Melanthera . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in South and Central America .
features
Macroscopic features
Uromyces columbianus 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 columbianus grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow predominantly on the upper side of the surface of the host leaves. The aecia of the species growing along the lower leaf veins are vesicular. Their hyaline aeciospores are 18–23 × 16–18 µm in size, spherical to broadly ellipsoidal and warty. The uredia of the mushroom growing on the underside of the leaves are cinnamon brown. The uredospores, which are also cinnamon-brown, are 19–21 × 17–19 µm in size, ovate to broadly ellipsoidal and spiky. The parts of the species that grow underneath the leaves are cinnamon-brown, compact and uncovered. The golden-brown teliospores are unicellular, usually broadly ovate to long ellipsoidal, smooth and mostly 28–33 × 15–18 µm in size. Their stem is colorless and up to 55 µm long.
distribution
The known distribution area of Uromyces columbianus extends from South America to Florida and the Caribbean .
ecology
The host plants of Uromyces columbianus are various Melanthera 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 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 .