Puccinia australis
| Puccinia australis | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia australis | ||||||||||||
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Puccinia australis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of sedum plant and the sweet grass genus Cleistogenes . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It iswidespread in the Palearctic .
features
Macroscopic features
Puccinia australis 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 australis grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The aecia of the fungus have 18–20 × 16–18 µm large, hyaline aeciospores with a wrinkled surface. The light orange uredia of the species mostly grow on the upper side of the leaves of the host plant. Their light yellow to colorless uredospores are usually ovate to broadly ellipsoidal, 17–22 × 16–18 µm in size and finely spiky. The parts of the species growing underneath the leaves are blackish, powdery and uncovered early. The deep golden to hazelnut brown teliospores of the fungus are two-celled, usually ellipsoidal to broadly ovate and 30–40 × 21–24 µm in size. Their stem is colorless to pale yellow and up to 100 µm long.
distribution
The known distribution area of Puccinia australis includes the Palearctic .
ecology
The host plants of Puccinia australis are for the haploid sedum ( Sedum spp.) And Cleistogenes serotina and C. squarrosa for the dikaryotic . 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, Uredien, Spermogonia and Aecien and changes host.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .