Puccinia cacao
| Puccinia cacao | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia cacao | ||||||||||||
| McAlpine |
Puccinia cacao is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the water friend and Hemarthria species as well as Hackelochloa porifera . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to Australia .
features
Macroscopic features
Puccinia cacao 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 cacao grows, as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The aecia of the species have wrinkled, hyaline 24–31 × 18–26 µm large aecidiospores. The hazelnut brown uredia grow on both sides of the host's leaves. Their cinnamon - brown uredospores are cinnamon to hazelnut brown, ovate to broadly ellipsoidal, 32–40 × 23–29 µm in size and finely spiky. The parts of the species grow on both sides of the leaves. The hazel-brown teleutospores are two-celled, ovate to ellipsoidal and 30–39 × 18–22 µm in size; their stem is hyaline and thin.
distribution
The known distribution area of Puccinia cacao is limited to Australia .
ecology
The host plants of Puccinia cacao are various water lovers as Haplont and various Hemrthria species as well as Heckelochia porifere as Dikaryont . 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 with Telien and Uredien, which manages without change of host. Spermogonia and aecidia are absent.
literature
- George B. Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .