Puccinia arthurella
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| Puccinia arthurella | ||||||||||||
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Puccinia Arthur ella is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sunflower genus Lactuca intybacea . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in Central America .
features
Macroscopic features
Puccinia arthurella 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 arthur ella is growing as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia and aecia are not yet known. The uredia of the fungus, which predominantly grow on the underside of the host leaves, are cinnamon brown. Their cinnamon or golden brown uredospores are 21–26 × 18–22 µm in size, ellipsoidal to broadly ellipsoidal and spiky. The parts of the species that grow underneath the leaves are chestnut brown, powdery and uncovered early. The chestnut-brown teliospores are two-celled, usually broad to long ellipsoid, wrinkled and 30–36 × 18–22 µm in size. Their stem is colorless.
distribution
The known distribution area of Puccinia arthurella includes eastern Mexico and the Caribbean . Finds are also known from Venezuela.
ecology
The host plant of Puccinia arthurella is Lactuca intybacea . 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.
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .