Uromyces bidenticola
| Uromyces bidenticola | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces bidenticola | ||||||||||||
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Uromyces bidenticola is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of two teeth . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is distributed worldwide in the tropics and subtropics.
features
Macroscopic features
Uromyces bidenticola 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 bidenticola 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 grow around the spermogonia. Their cinnamon-brown aeciospores are 26–33 × 21–24 µm in size, ovate to broadly ellipsoid and warty. The uredia of the fungus, growing on both sides or mostly underneath the leaves, are cinnamon brown or darker. The uredospores, which are also cinnamon-brown, are 26–33 × 21–24 µm in size, ovate to broadly ellipsoidal and spiky. The predominantly underside of the leaf growing parts of the species are cinnamon brown, compact and uncovered. The golden-brown teliospores are unicellular, usually broadly ovate to long ellipsoidal, smooth and mostly 32–40 × 17–20 µm in size. Their stem is colorless and up to 55 µm long.
distribution
The known distribution area of Uromyces bidenticola includes the tropical and subtropical regions around the world.
ecology
The host plants of Uromyces bidenticola are different two-tooth species ( Bidens spp.). 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 .