Puccinia vallartensis
| Puccinia vallartensis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia vallartensis | ||||||||||||
| Hens & Cummins |
Puccinia vallartensis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Baccharis trinervis . 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 vallartensis 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 vallartensis grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia usually grow on the upper side of the host leaves. The aecia of the species growing underneath the leaves emerge through pores and are yellow. They have 27–34 × 20–24 µm in size, usually broadly ovate to broadly ellipsoidal and hyaline aeciospores with a spiky surface. The fungus does not develop uredia . The parts of the species growing underneath the leaves are cinnamon-brown, grouped around the aecia and powdery. The light golden-brown teliospores are two-celled, usually cylindrical to narrow ellipsoidal and 50–66 × 19–24 µm in size. Their stem is colorless and up to 70 µm long.
distribution
The known distribution area of Puccinia vallartensis only includes Mexico .
ecology
The host plant of Puccinia vallartensis is Baccharis trinervis . 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 in 1973 by Joe Fleetwood Hennen and George Baker Cummins .
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .