Uromyces dactyloctenii
| Uromyces dactyloctenii | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces dactyloctenii | ||||||||||||
| Wakef. & Hansf. |
Uromyces dactyloctenii is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grasses Dactyloctenium aegyptium and Microchloa indica . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is spread pantropically .
features
Macroscopic features
Uromyces dactyloctenii 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 Uromyces dactyloctenii grows as with all Uromyces 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 fungus grow on the underside of the host leaves. Their golden to cinnamon-brown uredospores are 23–27 × 20–23 µm in size, mostly broadly ellipsoidal and spiky. The parts of the species are blackish and late exposed. The chestnut-brown teliospores are unicellular, ovate to broadly ellipsoid and 24–28 × 18–22 µm in size. The stem is colorless to yellowish and up to 25 µm long.
distribution
The known distribution area of Uromyces dactyloctenii includes the tropics of South America , Central Africa and the Philippines . The species was also found on several Pacific islands (e.g. Samoa , Nauru and Solomon Islands ).
ecology
The host plants of Uromyces dactyloctenii are Dactyloctenium aegyptium and Microchloa indica . 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 .
Individual evidence
- ↑ GBIF portal Ocurrence Search; accessed on January 1, 2013. ( Page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
