Puccinia diploma
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| Scientific name | ||||||||||||
| Puccinia diploma | ||||||||||||
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Puccinia diplachnis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the red family of the Bouvardia genus and the sweet grasses Bouteloua gracilis and Leptochloa dubia . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in North America .
features
Macroscopic features
Puccinia diplachnis 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 diplachnis grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The systemically growing aecia of the fungus have 20–26 × 19–23 µm , ellipsoidal to spherical, hyaline aeciospores with a wrinkled surface. The orange uredia of the species mostly grow on the top of the leaves of the host plant. Their colorless to light yellow uredospores are usually broadly ovate to broadly ellipsoidal, 22–26 × 20–24 µm in size and finely spiky. The parts of the species, mostly growing on the underside of the leaves and on sheaths, are black-brown, powdery and exposed early. The hazelnut-brown teliospores of the fungus are two-celled, usually broadly ovate to broadly ellipsoidal and 32–40 × 19–25 µm in size. Their stalk is brownish and up to 125 µm long.
distribution
The well-known distribution area of Puccinia diplachnis extends from central Mexico to the southern USA .
ecology
The host plants of Puccinia diplachnis are for haplonts different Bouteloua TYPES and Bouteloua gracilis and Leptochloa dubia for dikaryotic . 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, Uredien, Spermogonia and Aecien and changes host.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .