Puccinia arthuriana
| Puccinia arthuriana | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia arthuriana | ||||||||||||
| Jackson |
Puccinia arthuriana is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Vernonis canescens . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in South and Central America .
features
Macroscopic features
Puccinia arthuriana can only be recognized with the naked eye by means of the spore beds emerging 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 arthuriana grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow on the upper side of the host leaves. The aecia of the species growing underneath the leaves are in small groups. They have 22–26 × 20–23 µm in size, spherical to broadly ellipsoidal and light yellowish aeciospores with a spiky surface. The uredia of the mushroom are unknown and may be missing. The parts of the species growing underneath the leaves are cinnamon-brown, powdery and uncovered. The light cinnamon-brown to golden teliospores are two-celled, usually spindle-shaped to narrow ellipsoidal and 55–70 × 15–20 µm in size. Their stem is colorless and up to 75 µm long.
distribution
The known distribution area of Puccinia arthuriana includes Central America including the Caribbean and South America .
ecology
The host plant of Puccinia arthuriana is Vernonis canescens . 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 .