Puccinia interveniens
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| Puccinia interveniens | ||||||||||||
| Bethel |
Puccinia interveniens is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the mallow family and the sweet grass genera Nassella and Stipa . 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 America.
features
Puccinia interveniens 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.
The mycelium of Puccinia interveniens grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The aecia of the species have 18–27 × 16–24 µm , mostly spherical to ellipsoidal aeciospores with a wrinkled surface. The parts of the species that grow on the top of the leaves are dark brown, powdery and up to 5 cm long. They grow in rows and often flow together in up to 5 mm long lines. The golden to chestnut-brown teliospores are two-celled, broadly ellipsoidal to ellipsoidal and 42–60 × 23–30 µm in size. The stem is colorless to yellowish and up to 200 µm long.
distribution
The known distribution area of Puccinia interveniens extends from western South America to the western USA .
ecology
The host plants of Puccinia interveniens are for the Haplont mallow family (Malvaceae spp.) And for the dikaryote there are various Nassella and Stipa species. 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 has a development cycle with Telien, Aecien and Spermogonia and changes host.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .