Puccinia oblata
| Puccinia oblata | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia oblata | ||||||||||||
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Puccinia oblata is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sunflower genus Notoptera . 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 oblata 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 oblata 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 bilateral growing aecia of the species are cylindrical and white. Their cinnamon to golden brown aeciospores are 26–29 × 20–25 µm in size, spherical to ellipsoid and warty. The uredia of the fungus, which mainly grow on the underside of the leaves, are cinnamon brown. Their light cinnamon-brown uredospores are 19–24 × 22–26 µm in size, depressed, spherical and spiky. The parts of the species growing on the underside of the leaves and on stems are chocolate brown, powdery and uncovered. The cinnamon to clear chestnut brown teliospores are two-celled, usually ellipsoidal, wrinkled and mostly 32–37 × 22–25 µm in size. Their stem is colorless.
distribution
The known distribution area of Puccinia oblata extends from Guatemala to Belize .
ecology
The host plants of Puccinia oblata are Notoptera brevipes and N. scabridula . 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 .