Puccinia oaxacana
| Puccinia oaxacana | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia oaxacana | ||||||||||||
| Dietel & Holway |
Puccinia oaxacana is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Archibaccharis torquis . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in much of Central America.
features
Macroscopic features
Puccinia oaxacana 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 oaxacana grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow on both sides in small groups on the host leaves. The short-cylindrical aecia of the species, which also grow on both sides and on branches, are whitish. They have 25–35 × 17–23 µm, mostly ellipsoidal aeciospores with a warty surface. The uredia of the fungus growing underneath the leaf are light brown and scattered. Their golden to light brown uredospores are 23–28 × 19–21 µm in size, egg-shaped and spiky. The parts of the species that grow underneath the leaves are cinnamon-brown, compact and uncovered. The golden-brown teliospores are two-celled, usually ellipsoidal to long-ellipsoidal and 35–48 × 19–24 µm in size. Their stem is colorless and up to 90 µm long.
distribution
The well-known distribution area of Puccinia oaxacana extends from Costa Rica to Mexico .
ecology
The host plant of Puccinia oaxacana is Archibaccharis torquis . 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 goes through a development cycle with Spermogonia, Aecien, Telien and Uredien.
literature
- George Baker Cummins : The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .