Puccinia oahuensis
| Puccinia oahuensis | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Puccinia oahuensis | ||||||||||||
| Elliot & Evans |
Puccinia oahuensis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of fingergrass ( Digitaria spp.). Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. The range includes warm temperate to tropical regions around the world.
features
Macroscopic features
Puccinia oahuensis 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 oahuensis grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Spermogonia or aecidia are not known. The yellow-brownish uredia grow on the underside of the leaves. Your uredospores are oval to egg-shaped, 25–32 × 20–25 µm in size, golden to cinnamon brown and finely spiky. The parts of the species are black and covered by the epidermis. The brown teleutospores are two-celled, club-shaped to elongated and 25–45 × 16–22 µm in size; their stalk is 20 µm long and hyaline to brownish.
distribution
The range of Puccinia oahuensis includes warm and tropical regions around the world.
ecology
The host plants of Puccinia oahuensis are finger millet ( digitatum spp.). 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, Spermogonia and Aecidien absent.
literature
- George B. Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .