Uropyxis daleae
| Uropyxis daleae | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uropyxis daleae | ||||||||||||
| ( Dietel & Holw. ) Magnus |
Uropyxis daleae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the legume genus Dalea . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in much of America.
features
Macroscopic features
Uropyxis daleae can only be recognized with the naked eye by means of 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 Uropyxis daleae grows as with all Uropyxis intercellular types, and forms Saugfäden that grow into the storage tissue of the host. The spermogonia and aecia of the species are not yet known. Their yellowish aeciospores are 21–26 × 15–19 µm in size, ovate to broadly ellipsoidal and spiky. The uredia of the fungus growing on the underside of the host leaves or stems are yellow-brown and framed by paraphyses. The light cinnamon to golden brown uredospores are 20–24 × 18–20 µm in size, broadly ovate to broadly ellipsoidal and spiky. The mostly underside of the leaf growing parts of the species are black-brown, powdery and uncovered, they have paraphyses. The chestnut-brown teliospores are two-celled, spiky and usually 35–42 × 25–28 µm in size. Their stalk is colorless and apically up to 25 µm wide.
distribution
The known distribution area of Uropyxis daleae extends from South America to the south of the USA .
ecology
The host plants of Uropyxis daleae are diverse Dalea species. 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 macrocyclical development cycle of which only uredia, telia and their host are known so far. It cannot therefore be said whether she will change host .
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .