Puccinia variabilis
| Puccinia variabilis | ||||||||||||
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Puccinia variabilis |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia variabilis | ||||||||||||
| Greville |
Puccinia variabilis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the common dandelion ( Taraxacum officinale ). Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common all over the northern hemisphere.
features
Macroscopic features
Puccinia variabilis 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 variabilis grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia are unknown. The whitish aecia of the species grow predominantly on the underside in groups on the surface of the host leaves. Their pale yellowish aeciospores are 19–26 × 19–23 µm in size, spherical to broadly ellipsoidal and finely warty. The uredia growing on both sides of the mushroom are cinnamon brown. The cinnamon - brown uredospores of the species are 22–30 × 18–22 µm in size, ovate to broadly ellipsoidal and spiky. The bilateral growing parts of the species are black-brown, powdery and uncovered. The clear maroon teliospores are two-celled, generally ellipsoidal to broadly ellipsoidal, wrinkled and usually 35–42 × 25–28 µm in size. Their stem is colorless.
distribution
The known distribution area of Puccinia variabilis coincides with the distribution of its host species, it can be found in large parts of the northern hemisphere and has also been introduced in the southern hemisphere.
ecology
The host plant of Puccinia variabilis is the common dandelion ( Taraxacum officinale ) and other species of the genus. 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 a self-sufficient 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 .
Individual evidence
- ↑ Cybertruffles's Robingalia: accessed February 17, 2013
