Puccinia subnitens
| Puccinia subnitens | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia subnitens | ||||||||||||
| Dietel |
Puccinia subnitens is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of asterids and carnation-like species as well as of the sweet grass genera Distichlis and Monanthochloe . 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 America.
features
Macroscopic features
Puccinia subnitens can only be recognized with the naked eye from 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 subnitens grows as with all Puccinia intercellular types, and forms Saugfäden that grow into the storage tissue of the host. The cylindrical aecia of the species have 15–23 × 13–21 µm large, spherical, colorless to yellowish aeciospores with a warty surface. The compact, yellow-brown uredia of the fungus grow on the upper side of the host leaves. Their golden-brown uredospores are 20–26 × 19–24 µm in size, spherical to broadly ellipsoidal and warty. The parts of the species that grow on the top of the leaves are black-brown, compact and open early. They grow in rows and often flow together in up to 5 mm long lines. The chestnut-brown teliospores are two-celled and 36–46 × 19–24 µm in size. Their stem is colorless and up to 160 µm long.
Species delimitation
Puccinia aristidae is very similar , especially its uredospores, which some authors regard as a synonym for Puccinia subnitens . Cummins sees the species that occurs on Aristida species, however, as a separate species.
distribution
The known range of Puccinia subnitens extends from western South America to continental and coastal North America .
ecology
The host plants of Puccinia subnitens are for haplonts asteroids and Caryophyllales and Monanthochloe littoralis and various Distichlis TYPES 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, Aecien and Spermogonia and changes host.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .