Uropyxis diphysae
| Uropyxis diphysae | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uropyxis diphysae | ||||||||||||
| ( Arthur ) Cummins |
Uropyxis diphysae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the legume genus Diphysa . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in Central America .
features
Macroscopic features
Uropyxis diphysae 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 diphysae grows as with all Uropyxis TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow on both sides in small groups on the host leaves. The aecia of the species are not known. The same applies to the uredia of the mushroom, it may not develop any. The pale yellowish uredospores are 18–22 × 14–16 µm in size, ovate to ellipsoid and spiky. The bilateral growing parts of the species are black-brown, powdery and uncovered, they have paraphyses. The cinnamon-brown to golden teliospores are two-celled and double-walled, as a rule broadly ellipsoidal, spiky and usually 36–44 × 24–27 µm in size. Its stalk is colorless and swollen apically.
distribution
The known distribution area of Uropyxis diphysae extends from southern Mexico to Costa Rica .
ecology
The host plants of Uropyxis diphysae are Diphysa robinioides and D. suberosa . 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 microcyclic development cycle with spermogonia, aecia and telia. As an auto-ecologic parasite, it does not 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 .