Puccinia seymouriana
| Puccinia seymouriana | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia seymouriana | ||||||||||||
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Puccinia seymouriana is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is a endoparasite of dog poison plants and of Spartina - grasses . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in eastern North America .
features
Macroscopic features
Puccinia seymouriana 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 seymouriana grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The aecia of the species have 32–42 × 28–35 µm large aeciospores with a wrinkled surface and a star-shaped lumen. The cinnamon-brown uredia of the species grow on the upper side of the leaves of the host plants. Their uredospores, which are also yellow, are broadly ellipsoidal to ovoid, 30–40 × 21–27 µm in size and finely spiky. The upper side growing parts are dark brown, uncovered early and small. The hazelnut-brown teliospores are two-celled, long ellipsoidal to cylindrical and 38–53 × 18–23 µm in size; their stalk is colorless and up to 100 µm long.
distribution
The known distribution area of Puccinia seymouriana includes the USA and Canada east of the Rocky Mountains .
ecology
The host plants of Puccinia seymouriana are various dog poison plants (Apocynaceae spp.) For the haplont and Spartina species for the dikaryote . 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 development cycle with Telien, Uredien, Spermogonia and Aecien and changes host.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .