Puccinia exornata
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| Puccinia exornata | ||||||||||||
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Puccinia exornata is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Baccharis thesioides . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in large parts of South and Central America.
features
Macroscopic features
Puccinia exornata 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 exornata grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow in small groups on both sides of the host leaves. The aecia of the species growing underneath the leaves are light orange. They have 27–32 × 24–27 µm in size, egg-shaped to ellipsoidal and hyaline aeciospores with a wrinkled surface. The uredia of the fungus that grow underneath the leaves are bright yellow. Their golden to cinnamon-brown uredospores are 26–34 × 21–24 µm in size, ovate to broadly ellipsoidal and spiky. The parts of the species that grow underneath the leaves are cinnamon-brown, compact and uncovered. The light golden-brown teliospores are two-celled, usually long ellipsoid and 44–55 × 20–26 µm in size. Their stem is colorless and up to 90 µm long.
distribution
The well-known distribution area of Puccinia exornata extends from South America to southern Mexico .
ecology
The host plant of Puccinia exornata is Baccharis thesioides . 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 goes through a development cycle with Spermogonia, Aecien, Telien and Uredien.
literature
- George Baker Cummins : The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .