Puccinia marianae
| Puccinia marianae | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia marianae | ||||||||||||
| Sydow & Sydow |
Puccinia marianae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sunflower family Sideranthus megacephalus . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to Florida .
features
Macroscopic features
Puccinia marianae 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 marianae 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 same applies to the uredia of the fungus and their uredospores. The parts of the species growing on both sides of the host leaves are black-brown, powdery and uncovered, they grow in loose groups. The deep golden to light chestnut brown teliospores are one to two-celled, variably shaped and 42–62 × 22–30 µm in size. Their stem is colorless and up to 125 µm long.
distribution
The known distribution area of Puccinia marianae only includes southern Florida .
ecology
The host plant of Puccinia marianae is Sideranthus megacephalus . 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, of which only Telien and their host are known; Uredien, 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 .