Puccinia invelata
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| Scientific name | ||||||||||||
| Puccinia invelata | ||||||||||||
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Puccinia invelata is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is a endoparasite the Asteraceae genera Verbesina and Parthenice . 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 invelata 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 invelata 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 fissured and stand in groups or individually. They have 19–30 × 17–24 µm, spherical to ellipsoidal, colorless aeciospores with a warty surface. The uredia of the fungus, which usually grow on the underside of the leaves, are dark cinnamon brown. Their cinnamon-brown uredospores are 23–28 × 18–22 µm in size, ovate to broadly ellipsoidal and spiky. The predominantly underside of the leaves of the species are black-brown, powdery, compact and uncovered. The light maroon teliospores are two-celled, usually broad-shaped to ellipsoidal and 35–50 × 22–28 µm in size. Their stem is colorless and up to 130 µm long.
distribution
The well-known distribution area of Puccinia invelata extends from southern Arizona to Mexico .
ecology
The host plants of Puccinia invelata are various Verbesina species and Parthenice mollis . 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 .