Puccinia viatica
Puccinia viatica | ||||||||||||
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Systematics | ||||||||||||
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Scientific name | ||||||||||||
Puccinia viatica | ||||||||||||
Hens & Cummins |
Puccinia viatica is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Porophyllum punctatum . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to Mexico .
features
Macroscopic features
Puccinia viatica 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 viatica grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia and aecia are unknown. The uredia of the fungus growing on the underside of the host leaves are yellow-brown. Their light golden brown uredospores are 24–28 × 22–25 µm in size, spherical to broadly ellipsoidal and spiky. The parts of the species that grow underneath the leaves are black-brown and powdery. The chestnut-brown teliospores are two-celled, generally broad ellipsoid, wrinkled and 36–42 × 23–29 µm in size. Their stem is colorless and up to 42 µm long.
distribution
The known distribution area of Puccinia viatica only includes the Mexican Jalisco .
ecology
The host plant of Puccinia viatica is Porophyllum punctatum . 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 macrocyclical development cycle , of which only Telien and Uredien and their host are known so far; Spermogonia and Aecien could not be assigned to her.
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .