Puccinia verbesinae
| Puccinia verbesinae | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia verbesinae | ||||||||||||
| Schweinitz |
Puccinia verbesinae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the composites of the 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 the southeastern United States .
features
Macroscopic features
Puccinia verbesinae 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 verbesinae 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 that grow underneath the leaves are cylindrical and form small groups. They have hyaline and spherical to broadly ellipsoidal aeciospores with a warty surface that are 20–25 × 17–20 µm in size . The uredia of the fungus, which mainly grow on the underside of the leaves, are cinnamon brown. Your uredospores are 20–24 × 19–23 µm in size, ovate to triangular ovoid, cinnamon-brown and spiky. The parts of the species that grow on the underside of the leaves are black-brown, more or less powdery and uncovered. The chestnut-brown teliospores are two-celled, usually broadly ellipsoidal and 36–42 × 24–28 µm in size. Their stem is up to 65 µm long.
distribution
The known range of Puccinia verbesinae includes the southeastern United States and Mexico .
ecology
The host plants of Puccinia verbesinae are Verbesina alternifolia and V. occidentalis . 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 .
Individual evidence
- ↑ GBIF Portal ( Memento of the original from March 4, 2016 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. : Ocurrence Search: accessed on January 23, 2013
