Puccinia avocensis
| Puccinia avocensis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia avocensis | ||||||||||||
| Wang |
Puccinia avocensis is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass Stipa spartea . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It occurs in the Midwest .
features
Macroscopic features
Puccinia avocensis 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 avocensis grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Aecia or spermogonia of the species are not known, the same applies to uredia of the fungus or its uredospores. The parts of the species that grow on the upper side are brown, powdery and up to 2 cm long. The golden to light chestnut brown teliospores are one to two-celled, broadly ellipsoid and 37–44 × 25–28 µm in size. Their stem is colorless and up to 100 µm long.
distribution
The known distribution area of Puccinia avocensis only includes the US-American Wisconsin .
ecology
The host plant of Puccinia avocensis is for the dikaryote Stipa spartea . The haplont could grow on Callirhoe triangulata , a mallow family . 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 of which only Telien and their host are known; Uredien, Spermogonia and Aecien could not be assigned to the fungus.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin et al. 1971, ISBN 3-540-05336-0 .