Puccinia cnici-oleracei
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Puccinia cnici-oleracei on a cabbage thistle leaf |
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| Persoon ex Desmazières |
Puccinia cnici-oleracei is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of various types of daisy family. Symptoms of the attack by the species are rust spots and pustules on the leaf surfaces of the host plants. It is spread all over the world.
features
Macroscopic features
Puccinia cnici-oleracei 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 cnici-oleracei 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 parts of the species growing on the underside of the host leaves and on stems are black-brown, compact and uncovered, they are in dense groups. The teliospores are two-celled, usually long ovate to oblong and 37–50 × 15–20 µm in size. Their stem is colorless to yellowish and up to 50 µm long.
distribution
The known distribution area of Puccinia cnici-oleracei includes the whole world.
ecology
The host plants of Puccinia cnici-oleracei are various sunflower species of the genera Aster , Artemisia , Achillea , Agoseris , Achillea , Erigeron , Hieracium , Krigia , Prenanthes and Rudbeckia . 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 cnici-oleracei was first scientifically described in 1823. 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 assumed that these species are all conspecific with Puccinia xanthii . It has been proposed to classify Puccinia cnici-oleracei as a morpho species and classify the remaining species as varieties. However, due to age , the name Puccinia xanthii takes precedence. Puccinia cnici-oleracei would therefore only be 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: Are the microcyclic rust species Puccinia melampodii and Puccinia xanthii conspecific? In: Mycological research. 2009; 113, pp. 1271-1282. doi: 10.1016 / j.mycres.2009.08.009 .
- ↑ JF Hennen, MB Figueiredo, AA de Carvalho Jr, PG Hennen: Catalog of the Species of Plant Rust Fungi (Uredinales) of Brazil. 2005. (online)
