Puccinia cococlinii
| Puccinia cococlinii | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia cococlinii | ||||||||||||
| Seymour ex Burrill |
Puccinia cococlinii is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is a endoparasite the Korbblütlergattungen Eupatorium , Alomia and ageratum . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in much of America.
features
Macroscopic features
Puccinia cococlinii 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 cococlinii grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Most of their spermogonia grow on the underside of the host leaves. The aecia of the species growing on both sides or mostly underneath the leaves are gregarious. Their pale yellowish aeciospores are 23–27 × 17–21 µm in size, almost spherical to irregularly ellipsoidal and spiky. The uredia of the fungus, which mainly grow on the underside of the leaves, are cinnamon brown. The golden - brown uredospores are 22–26 × 20–24 µm in size, ovate to spherical and spiky. The predominantly underside of the leaf growing parts of the species are black-brown, compact and uncovered. The deep golden to chestnut brown teliospores are two-celled, usually long to broadly ellipsoid, wrinkled and usually 40–48 × 28–33 µm in size. Their stem is colorless and up to 150 µm long.
distribution
The known distribution area of Puccinia cococlinii extends from South America to the central USA .
ecology
The host plants of Puccinia cococlinii are Alomia microcarpa as well as Eupatorium and Ageratum species. 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 .