Puccinia pogonarthriae
| Puccinia pogonarthriae | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia pogonarthriae | ||||||||||||
| Hopkins |
Puccinia pogonarthriae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grasses Pogonarthria squarrosa and Eragrostis chalcantha . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in southern Africa.
features
Macroscopic features
Puccinia pogonarthriae can only be recognized with the naked eye from 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 pogonarthriae 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 fungus usually grow on the top of the host leaves. Their hyaline uredospores are 25–28 × 21–24 µm in size, broadly ellipsoidal to broadly ovate and finely spiky. The parts of the species growing on the top of the leaves are chocolate brown, powdery and exposed early. The golden to light hazelnut brown teliospores are two-celled, ellipsoidal and 30–37 × 21–25 µm in size. Their stem is colorless and up to 100 µm long.
distribution
The known distribution area of Puccinia pogonarthriae includes Malawi , Zimbabwe and South Africa .
ecology
The host plants of Puccinia pogonarthriae are Pogonarthria squarrosa and Eragrostis chalcantha . 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 .