Puccinia vexans
| Puccinia vexans | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia vexans | ||||||||||||
| Farlow |
Puccinia vexans is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is a endoparasite of Fouquieria TYPES well as Bouteloua - grasses . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in large parts of America.
features
Macroscopic features
Puccinia vexans 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 vexans grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The aecia of the species have 27–32 × 23–27 µm large, approximately spherical and hyaline aeciospores. The cinnamon-brown uredia of the species grow on both sides of the leaves of the host plant. Their cinnamon-brown uredospores are usually spherical to broadly ellipsoidal, 20–30 × 22–29 µm in size and finely spiky. The species has 34–43 × 26–35 µm large amphispores that are broadly ellipsoidal to egg-like in shape and colored hazel-brown. Growing on both leaf surfaces Telien the type are black, powdery and soon uncovered. The hazelnut-brown teliospores of the fungus are two-celled, usually broadly ellipsoidal and 32–40 × 23–29 µm in size. Their stalk is hyaline and up to 95 µm long.
distribution
The known distribution area of Puccinia vexans extends from the United States southwards to Peru and Argentina .
ecology
The host plants of Puccinia vexans are for the Haplonts Fouqueria columnaris and F. splendens and Bouteloua breviseta and B. curtipendula for the dikaryote . 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 .