Uromyces salmeae
| Uromyces salmeae | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces salmeae | ||||||||||||
| Arthur & Holway |
Uromyces salmeae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Salmea scandens . 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 and the Caribbean .
features
Macroscopic features
Uromyces salmeae 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 salmeae grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Your spermogonia grow on both sides of the surface of the host leaves. The bilateral aecia of the species grow in small groups and break up easily. Their yellowish to brown aeciospores are 32–45 × 23–26 µm in size, elongated to ellipsoid and warty. The uredia of the fungus, which mainly grow on the underside of the leaves, are cinnamon brown or darker. The light cinnamon-brown uredospores are 30–36 × 24–27 µm in size, ovate to broadly ellipsoidal and spiky. The parts of the species growing underneath the leaves are dark cinnamon-brown, compact and uncovered. The yellowish to golden brown teliospores are unicellular, usually oblong to ellipsoid, smooth and mostly 38–50 × 17–22 µm in size. Their stem is colorless and up to 65 µm long.
distribution
The known distribution area of Uromyces salmeae includes Guatemala and Puerto Rico .
ecology
The host plant of Uromyces salmeae is Salmea scandens . 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 .