Puccinia vaga
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| Scientific name | ||||||||||||
| Puccinia vaga | ||||||||||||
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Puccinia vaga is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is a endoparasite the daisy family genus Verbesina . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in southern North America .
features
Macroscopic features
Puccinia vaga can only be recognized with the naked eye by means of the spore beds emerging 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 vaga 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 underneath the leaves are yellow to sand-colored and stand individually or in groups. They have 21–28 × 18–22 µm in size, spherical to broadly ellipsoidal, colorless aeciospores with a warty surface. The uredia growing on both sides of the mushroom are cinnamon brown. Their golden to light cinnamon-brown uredospores are 23–27 × 19–23 µm in size, ovate to broadly ellipsoidal and spiky. The parts of the species growing on both sides and on stalks are black-brown, tend to be powdery and uncovered. The chestnut-brown teliospores are two-celled, usually ellipsoidal and 38–46 × 24–28 µm in size. Their stem is colorless and up to 115 µm long.
distribution
The well-known distribution area of Puccinia vaga extends from southwest Texas to southwest Mexico .
ecology
The host plants of Puccinia vaga are Verbesina oreophila and V. sphaerocephala . 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 development cycle with Spermogonia, Aecien, Telien and Uredien, but 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 .