Puccinia semi-insculpta
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| Puccinia semi-insculpta | ||||||||||||
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Puccinia semi-insculpta is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the genus Vernonia . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in South and Central America .
features
Macroscopic features
Puccinia semi-insculpta 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 Puccinia semi-insculpta grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow on the upper side of the host leaves. The aecia of the species growing on the top of the leaves are light yellow-brown. Their light golden to almost hyaline aeciospores are 24–30 × 21–24 µm in size, ovate to broadly ellipsoidal and spiky. The uredia of the fungus, which grow on both sides, are light yellow-brown. Their colorless to pale gold uredospores are 24–30 × 21–24 µm in size, ovate to broadly ellipsoidal and spiky. The parts of the species growing on the top of the leaves are uncovered. The dark maroon teliospores are two-celled, usually broad ellipsoid, wrinkled and mostly 42–56 × 22–40 µm in size. Their stem is colorless and up to 85 µm long.
distribution
The known distribution area of Puccinia semi-insculpta extends from Mexico to South America .
ecology
The host plants of Puccinia semi-insculpta are various sham asters ( Vernonia 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 .