Puccinia thiensis
| Puccinia thiensis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia thiensis | ||||||||||||
| Huguenin |
Puccinia thiensis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of Paspalum orbiculare . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is endemic to New Caledonia .
features
Macroscopic features
Puccinia thiensis can only be recognized with the naked eye by means of the spore beds emerging 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 thiensis grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The aecia of the species are not yet known. The cinnamon-brown uredia usually grow on the underside of the host's leaves. Their cinnamon - brown uredospores are mostly ovate, 26–32 × 21–25 µm in size and finely spiky. The parts of the species are black-brown, exposed early and compact. The hazelnut-brown teliospores are two-celled, usually ovoid and 30–40 × 16–22 µm in size; their stalk is brown and up to 20 µm long.
distribution
The known distribution area of Puccinia thiensis only includes New Caledonia .
ecology
The host plant of Puccinia thiensis is Paspalum orbiculare . 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 apparently has a development cycle with Telien and Uredien, which manages without change of host; Spermogonia and aecia are apparently absent.
literature
- George B. Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .