Puccinia exasperans
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| Holway |
Puccinia exasperans is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of Bouteloua - 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 southern North America .
features
Macroscopic features
Puccinia exasperans 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 exasperans 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 cinnamon-brown uredia of the fungus grow on both sides of the host leaves. Their cinnamon-brown uredospores are 22–29 × 17–25 µm in size, broadly ellipsoidal to spherical and finely spiky. The bilateral growing parts of the species are blackish, powdery and exposed early. The golden to light hazelnut brown teliospores are two-celled, often vertically septate, spherical to broadly ellipsoid and 24–31 × 17–26 µm in size. Their stalk is yellowish and up to 125 µm long.
distribution
The known distribution area of Puccinia exasperans includes Mexico and the southern United States .
ecology
The host plants of Puccinia exasperans are different species of Bouteloua . 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 et al. 1971, ISBN 3-540-05336-0 .