Puccinia otopappicola
| Puccinia otopappicola | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia otopappicola | ||||||||||||
| Jørstad |
Puccinia otopappicola is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Otopappus brevipes and Otopappus curviflorus . 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 otopappicola 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 otopappicola grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow predominantly on the upper side on the surfaces of the host leaves. The brownish aecia of the species grow predominantly on the underside along the leaf veins and are cylindrical. Their pale yellowish aeciospores are 26–40 × 15–26 µm in size, angular, spherical to elongated and smooth to warty. The fungus lacks uredia . The parts of the species, which predominantly grow on the underside of the leaves, are chocolate brown, powdery and uncovered. The chestnut-brown teliospores are two-celled, usually broadly ellipsoidal, wrinkled and mostly 30–38 × 22–28 µm in size. Their stem is colorless to brownish.
distribution
The known distribution area of Puccinia otopappicola includes Belize and Guatemala .
ecology
The host plants of Puccinia otopappicola are Otopappus brevipes and Otopappus curviflorus . 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 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 .