Uromyces trifolii
| Uromyces trifolii | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces trifolii | ||||||||||||
| ( Hedwig ex Candolle ) Léveillé |
Uromyces trifolii is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of white clover . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in large parts of the world.
features
Macroscopic features
Uromyces trifolii 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 trifolii grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The spermogonia and aecia of the species are unknown. The same applies to their uredia , they may not be trained. The parts of the species growing along the leaf veins and stems of the host leaves are chocolate brown, powdery and uncovered. The clear maroon teliospores are unicellular, usually ovoid to spherical, slightly warty and mostly 22–27 × 17–20 µm in size. Their stem is colorless.
distribution
The known distribution area of Uromyces trifolii includes the Holarctic , Neotropical and New Zealand .
ecology
The host plant of Uromyces trifolii is white clover ( Trifolium repens ). 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 probably microcyclical development cycle , of which only the telia and their host are known so far. It cannot therefore be said whether she will 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 .