Puccinia vilfae
| Puccinia vilfae | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Puccinia vilfae | ||||||||||||
| Arthur & Holway |
Puccinia vilfae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of verbena and sporobolus - sweet grasses . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in eastern North America and southern Africa.
features
Macroscopic features
Puccinia vilfae 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 vilfae 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 24–28 × 19–24 µm large, colorless aeciospores with a wrinkled surface and angular-spherical to ellipsoidal shape. The yellowish uredia of the species grow on both sides of the leaves of the host plants. Their colorless uredospores are ellipsoidal to ovate, 30–43 × 20–27 µm in size and finely spiky. The bilateral growing parts are dark brown, uncovered early and small. The hazelnut brown teliospores are two-celled, long ellipsoidal to ellipsoidal and 40–53 × 21–28 µm in size; their stalk is usually yellowish and up to 140 µm long.
distribution
The known distribution area of Puccinia vilfae includes the USA east of the Rocky Mountains , Mexico and South Africa .
ecology
The host plants of Puccinia vilfae are verbenas ( Verbenia spp.) For the haplont and Sporobolus species for the dikaryote . 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, Uredien, Spermogonia and Aecien and changes host.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .