Puccinia semota
| Puccinia semota | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Puccinia semota | ||||||||||||
| HS Jackson & Holway |
Puccinia semota is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Hymenostephium cordatum . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to Guatemala .
features
Macroscopic features
Puccinia semota can only be recognized with the naked eye by means of the spore beds emerging 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 semota grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia and aecia are unknown. The predominantly underside growing on the host leaves Telien the type are maroon, compact and uncovered, they are in dense groups. The golden to light cinnamon-brown teliospores are two-celled, usually long club-shaped to cylindrical and 40–58 × 13–17 µm in size. Their stem is colorless and up to 20 µm long.
distribution
The well-known distribution area of Puccinia semota extends from South America to Guatemala , an isolated occurrence is in New York .
ecology
The host plant of Puccinia semota is Hymenostephium cordatum . 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 microcyclic development cycle without uredia , of which only Telia and their host are known so far; Spermogonia and Aecien could not be assigned to her.
Systematics and taxonomy
Puccinia semota was scientifically described in 1918 by Herbert Spencer Jackson & Edward Willet Dorland Holway. The species is closely related to several very similar rusts, all of which are found in South and North America on different daisy family and differ only in their host. It is therefore suggested to classify all these species con-specifically with Puccinia xanthii . Puccinia xanthii is therefore a morpho species and the Puccinia semota is classified as a variety.
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .
Individual evidence
- ↑ Marion K. Seier, Louise Morín, Marlien van der Merwe, Harry C. Evans, Ángel Romero (2009) Are the microcyclic rust species Puccinia melampodii and Puccinia xanthii conspecific? Mycological research 113: 1271-1282. doi : 10.1016 / j.mycres.2009.08.009 .
- ↑ Hennen JF, Figueiredo MB, de Carvalho Jr AA, Hennen PG, 2005. Catalog of the Species of Plant Rust Fungi (Uredinales) of Brazil. Available online