Puccinia baccharidis
| Puccinia baccharidis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia baccharidis | ||||||||||||
| Dietel & Holway |
Puccinia baccharidis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Baccharis . 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 baccharidis 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 baccharidis grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Your spermogonia grow on both sides of the host leaves. The aecia of the species growing on the underside of the leaves and on stalks are light yellow and bursting. They have 30–48 × 22–26 µm in size, spherical to spindle-shaped, hyaline to light yellowish aeciospores with a warty surface. The uredia of the fungus growing on both sides are yellowish to cinnamon-brown. Their yellowish to golden brown uredospores are 32–43 × 20–24 µm in size, long ellipsoid and spiky. The parts of the species that grow underneath the leaves are light cinnamon brown and uncovered, they grow in groups. The golden-brown teliospores are two-celled, usually long ellipsoid and 50–68 × 24–28 µm in size. Their stem is colorless and up to 140 µm long.
distribution
The known distribution area of Puccinia baccharidis extends from South America to the southwest USA .
ecology
The host plants of Puccinia baccharidis are diverse Baccharis species. 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.
Systematics
Puccinia baccharidis was first described by Holway in 1893. The species is partially regarded as conspecific with Puccinia evadens .
literature
- George Baker Cummins : The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .