Puccinia intermixta
| Puccinia intermixta | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia intermixta | ||||||||||||
| Peck |
Puccinia intermixta is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Iva axillaris . 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 North America.
features
Macroscopic features
Puccinia intermixta 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 intermixta grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Your spermogonia grow on both sides of the host leaves. The aecia of the species, which predominantly grow on the underside of the leaves, are yellow, hemispherical and tear open irregularly. They have 19–30 × 16–25 µm in size, usually spherical to ellipsoidal and almost hyaline aeciospores with a warty surface. The fungus does not develop uredia . The leaves of the species growing on the underside of the leaves and on stems are black-brown, compact and uncovered. The deep golden to clear maroon teliospores are two-celled, usually ellipsoid to broadly ellipsoid and 32–42 × 20–26 µm in size. Their stem is colorless.
distribution
The known distribution area of Puccinia intermixta ranges from Manitoba and Alberta in Canada to California and New Mexico in the USA.
ecology
The host plant of Puccinia intermixta is Iva axillaris . 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, aecia and telia, but does not change host.
Taxonomy
The species was first described by Peck in 1879 .
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .