Puccinia praealta
| Puccinia praealta | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia praealta | ||||||||||||
| Jackson & Holway |
Puccinia praealta is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Vernonia heydeana and Vernonia triflosculosa . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in Central America .
features
Macroscopic features
Puccinia praealta 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 praealta grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia and aecia are so far unknown. The light yellow uredia of the fungus grow on the upper side of the surface of the host leaves. Their hyaline uredospores are 25–30 × 18–22 µm in size, egg-shaped and spiky. The parts of the species growing on the top of the leaves are black-brown, powdery and uncovered. The golden to light chestnut brown teliospores are two-celled, usually broad ellipsoidal to ellipsoidal, warty and usually 35–43 × 25–30 µm in size. Their stem is colorless.
distribution
The known distribution area of Puccinia praealta includes Central America .
ecology
The host plants of Puccinia praealta are the false asters Vernonia heydeana and V. triflosculosa . 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 macrocyclical development cycle with Spermogonia, Aecien, Telien and Uredien. As an auto-ecologic parasite, it does not change host .
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .