Puccinia arthuri
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| Puccinia arthuri | ||||||||||||
| Sydow & Sydow |
Puccinia arthuri is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass Pennisetum crinitum . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to Mexico .
features
Macroscopic features
Puccinia arthuri 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 arthuri 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 yellow-brown uredia of the fungus grow on both sides of the host's leaves. Their golden to cinnamon-brown uredospores are usually oval to broadly ellipsoid, 27–33 × 21–24 µm in size and finely spiky. The bilateral growing parts of the species are black-brown, powdery and uncovered early. The hazel-brown teliospores are two-celled, occasionally long-septate, usually long ovoid and 33–43 × 20–24 µm in size. The stem is colorless to yellowish and up to 100 µm long.
distribution
The known distribution area of Puccinia arthuri only includes Mexico .
ecology
The host plant of Puccinia arthuri is Pennisetum crinitum . 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 .