Puccinia macra
| Puccinia macra | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia macra | ||||||||||||
| Arthur & Holway |
Puccinia macra is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass genus Paspalum . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in northern South and Central America .
features
Macroscopic features
Puccinia macra 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 macra 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 orange to yellow uredia of the fungus usually grow on the underside of the host leaves. Their light yellowish uredospores are 27–35 × 23–25 µm in size, ellipsoidal to broadly ellipsoidal and finely spiky. The leaves of the species growing on the underside of the leaves and on sheaths are black-brown, powdery and exposed early. The golden to light hazel-brown teliospores are two-celled, usually club-shaped and 44–53 × 24–30 µm in size. Their stalk is yellowish to colorless and up to 80 µm long.
distribution
The known distribution area of Puccinia macra includes Central America and northern South America .
ecology
The host plants of Puccinia macra are Paspalum candidum and P. prostratum . 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 et al. 1971, ISBN 3-540-05336-0 .