Uromyces compactus
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| Uromyces compactus | ||||||||||||
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Uromyces compactus is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Aster spinosus . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in southern North America .
features
Macroscopic features
Uromyces compactus 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 compactus grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow in elongated groups on the surface of the host stem. The similarly growing aecia of the species are colorless to pale yellow. Their hyaline aeciospores are 28–35 × 22–27 µm in size, ellipsoidal to broadly ellipsoidal and warty. The uredia of the mushroom grow on stems and are cinnamon brown. The uredospores, which are also cinnamon-brown, are 32–40 × 23–28 µm in size, ovate to ellipsoidal and spiky. The parts of the species growing on stems are black-brown, compact and uncovered. The chestnut-brown teliospores are unicellular, usually ovoid to long ellipsoidal, smooth and mostly 33–42 × 22–28 µm in size. Their stalk is slightly yellowish and up to 60 µm long.
distribution
The known distribution area of Uromyces compactus includes the southwest USA and northern Mexico .
ecology
The host plant of Uromyces compactus is Aster spinosus . 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 .