Uromyces macnabbi
| Uromyces macnabbi | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uromyces macnabbi | ||||||||||||
| Cummins |
Uromyces macnabbi is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the sweet grass Danthonia raoulii . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. She is endemic to New Zealand .
features
Macroscopic features
Uromyces macnabbi 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 Uromyces macnabbi grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Aecia or spermogonia of the species are not known. The cinnamon-brown, powdery uredia of the fungus grow on the top of the host leaves. Its cinnamon-brown uredospores are 35–42 × 30–35 µm in size, usually ovate to broadly ellipsoidal and spiky. The parts of the species that grow on the upper side are black-brown, powdery and compact. The chestnut-brown teliospores are unicellular, usually ellipsoid and 30–42 × 18–21 µm in size. Their stalk is yellowish and up to 125 µm long.
distribution
The known distribution area of Uromyces macnabbi only includes New Zealand .
ecology
The host plant of Uromyces macnabbi is Danthonia raoulii . 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 Uredien and their host are known; Spermogonia and aecia could not be assigned to the fungus.
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .