Puccinia potosina
| Puccinia potosina | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Puccinia potosina | ||||||||||||
| Cummins , MP Britton & JW Baxter |
Puccinia potosina is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Eupatorium longifolium . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to Mexico .
features
Macroscopic features
Puccinia potosina 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 potosina 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 short-cylindrical aecia of the species growing in a circle around the spermogonia are cinnamon-brown. They have 24–27 × 19–22 µm, mostly egg-shaped to broadly ellipsoidal, golden to light cinnamon-brown aeciospores with a warty surface. The uredia of the fungus growing on the top of the leaves are cinnamon-brown and scattered. Their uredospores are similar in size and shape to the aeciospores. The parts of the species growing underneath the leaves are dark brown and uncovered. The light chestnut-brown teliospores are two-celled, usually slightly ovoid to ellipsoid and 33–40 × 21–25 µm in size. Their stem is colorless and up to 60 µm long.
distribution
The known distribution area of Puccinia potosina only includes northwestern Mexico .
ecology
The host plant of Puccinia potosina is Eupatorium longifolium . 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 and does not change host (autocial).
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .