Puccinia cenchri
| Puccinia cenchri | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia cenchri | ||||||||||||
| Dietel & Holway |
Puccinia cenchri is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of Cenchrus - sweet grasses . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common all over the southern hemisphere and beyond.
features
Macroscopic features
Puccinia cenchri 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 cenchri 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 cinnamon-brown uredia of the species grow on both sides or only on the underside of the leaves of the host plant. Their cinnamon - brown uredospores are broadly ellipsoidal to ellipsoidal, 31–34 × 24–27 µm in size and finely spiky. The mostly leaf underside growing Telien are black brown, long covered and compact. The hazelnut-brown to golden teliospores are two-celled, usually oblong to club-shaped and 37–44 × 20–24 µm in size; their stalk is up to 15 µm long.
distribution
The known distribution area of Puccinia cenchri includes the Caribbean , continental America from the southern USA to the south, Oceania and Central Africa .
ecology
The host plants of Puccinia cenchri are various Cenchrus species. 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 .