Puccinia obesiseptata
| Puccinia obesiseptata | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia obesiseptata | ||||||||||||
| Cummins |
Puccinia obesiseptata is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Eupatorium deltoideum . 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 obesiseptata 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 obesiseptata grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia and aecia are too dried up in the holotype to be described in detail. The uredia of the fungus, which usually grow on the underside of the host leaves, are cinnamon brown. Their uredospores, which are also cinnamon-brown, are 20–24 × 22–25 µm in size, roughly spherical and spiky. The parts of the species growing underneath the leaf are black-brown, powdery and uncovered. The chestnut-brown teliospores are two-celled, generally broadly ellipsoidal, wrinkled and 43–48 × 33–40 µm in size. Their stem is colorless and up to 150 µm long.
distribution
The known distribution area of Puccinia obesiseptata only includes Oaxaca .
ecology
The host plant of Puccinia obesiseptata is Eupatorium deltoideum . 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 with Spermogonia, Aecien, Telien and Uredien.
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .