Uromyces minor
| Uromyces minor | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces minor | ||||||||||||
| J. Schröt. |
Uromyces minor is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of clover . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It iswidespread in the Holarctic .
features
Macroscopic features
Uromyces minor 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 minor grows, as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia are unknown. The aecia of the species growing on both sides or mostly on the underside of the host leaves are short to cylindrical. Their hyaline aeciospores are 17–21 × 17–19 µm in size, spherical to broadly ellipsoidal and warty. The fungus apparently does not develop uredia . The parts of the species that grow on both or mainly underside of the leaf are black-brown, powdery and sooner or later uncovered. The mostly light chestnut-brown teliospores are unicellular, usually spherical to broadly ellipsoidal, warty and mostly 18–22 × 15–19 µm in size. Their stem is colorless.
distribution
The known distribution area of Uromyces minor extends from western North America to Europe .
ecology
The host plants of Uromyces minor are various types of clover ( Trifolium 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 microcyclic development cycle with spermogonia, aecia and telia. As an autocratic 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 .