Puccinia chaetii
| Puccinia chaetii | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia chaetii | ||||||||||||
| Kern & Thurston |
Puccinia chaetii is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the golden oat Trisetum sibiricum . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to Venezuela .
features
Macroscopic features
Puccinia chaetii 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 chaetii grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Aecia or spermogonia of the species are not known. The yellowish uredia of the species grow on both sides of the leaves of the host plant. Their light cinnamon - brown uredospores are approximately broadly ellipsoidal to ovate, 23–29 × 17–29 µm in size and finely spiky. The species also forms 27–35 × 26–29 µm large, egg-shaped amphispores of a dark cinnamon-brown color. The mostly leaf underside growing Telien are black brown, long covered and compact. The yellow to light hazelnut-brown teliospores are one to two-celled, usually club-shaped to sub-cylindrical and 38–44.5 × 20–26 µm in size; their stalk about 15 µm long.
distribution
The known distribution area of Puccinia chaetii only includes Venezuela .
ecology
The host plant of Puccinia chaetii is the golden oat Trisetum sibiricum . 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 has a development cycle of which only Telien and Uredien and their host are known; Spermogonia and aecia could not be assigned to the fungus.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .