Puccinia eatoniae
| Puccinia eatoniae | ||||||||||||
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| Puccinia eatoniae | ||||||||||||
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Puccinia eatoniae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of buttercups and Myosotis virginica as well as of Sphenopholis - sweet grasses . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in North America and the Caribbean .
features
Macroscopic features
Puccinia eatoniae can only be recognized with the naked eye by 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 eatoniae 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 species have 15–24 × 12–20 µm large, broad ellipsoidal to spherical and hyaline- light yellowish aeciospores. The yellow-brown uredia of the species grow on the upper side of the leaves of the host plant. Their light yellow to colorless uredospores are usually broadly ellipsoidal to ovate, 22–26 × 18–21 µm in size and finely spiky. The parts of the species growing on the ducts and underside of the leaves are brown and long covered. The hazelnut-brown teliospores of the fungus are two-celled, usually long, club-shaped and 35–52 × 13–19 µm in size. Their stalk is brownish and up to 15 µm long.
distribution
The well-known distribution area of Puccinia eatoniae extends from southern Canada via the USA to the Dominican Republic .
ecology
The host plants of Puccinia eatoniae are for haplonts different Ranunculus ( Ranunculus spp.) And the forget-me-not Myosotis virginica and Sphenopholis 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, 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 .