Puccinia tageticola
| Puccinia tageticola | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia tageticola | ||||||||||||
| Dietel & Holway |
Puccinia tageticola is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is a endoparasite the daisy family genus Tagetes . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in Central and South America .
features
Macroscopic features
Puccinia tageticola 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 tageticola 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 uredia of the fungus growing on both sides of the host leaves and stems are cinnamon brown. Their cinnamon-brown uredospores are 26–30 × 19–24 µm in size, ovate to ellipsoidal and spiky. The bilateral growing parts of the species are black-brown, powdery and uncovered. The chestnut-brown teliospores are two-celled, usually angular, broad, ellipsoidal and 42–50 × 28–35 µm in size. Their stem is colorless and up to 200 µm long.
distribution
The known distribution area of Puccinia tageticola extends from South America to Mexico .
ecology
The host plants of Puccinia tageticola are different species of Tagetes . 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 of which only Telien and Uredien and their host are known so far; Spermogonia and Aecien could not be assigned to her.
Taxonomy
The species was first described in 1897 by Paul Dietel and Edward Willet Dorland Holway .
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .