Puccinia fergussonii
| Puccinia fergussonii | ||||||||||||
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Puccinia fergussonii on Marsh Violets |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia fergussonii | ||||||||||||
| Berk. & Broome |
Puccinia fergussonii is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of violets . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in the northern hemisphere.
features
Macroscopic features
Puccinia fergussonii can only be recognized with the naked eye by 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 fergussonii grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Spermogonia and aecia of the species are absent. The same applies to uredia of the mushroom. The parts of the species growing on the undersides of the leaves and petioles of the host plants are chocolate brown and covered for a long time, later bare. They lie in dense, confluent groups and are powdery. The light brown teliospores are one- to two-celled, usually elongated, smooth and 26–45 × 12–18 µm in size. Their stem is colorless and up to 30 µm long.
distribution
The known distribution area of Puccinia fergussonii covers the entire northern hemisphere.
ecology
The host plants of Puccinia fergussonii are different types of violets ( Viola spp.). 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 has a microcyclic development cycle that includes only Telia and does not include Aecia, Spermogonia and Uredia.
literature
- Ernst Gäumann: The rust fungi of Central Europe. With special consideration of Switzerland . In: Contributions to the cryptogam flora in Switzerland . tape 12 . Commission publisher Buchdruckerei Büchler & Co, Bern 1959.
