Uropyxis nissoliae
| Uropyxis nissoliae | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Uropyxis nissoliae | ||||||||||||
| Dietel & Holw. |
Uropyxis nissoliae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the legume genus Nissolia . 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 nissoliae 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 nissoliae grows as with all Uropyxis intercellular types, and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow on the upper side in small groups on the host leaves. The aecia of the species growing opposite them are yellow-brown and have paraphyses. Their pale yellowish aeciospores are 15–18 × 17–16 µm in size, spherical to broadly ellipsoidal and spiky. The uredia of the fungus resemble its aecia, also in their spores. The bilateral growing parts of the species are black-brown, powdery and uncovered early. The chestnut-brown teliospores are unicellular, generally ellipsoidal to long-ellipsoidal, spiky and usually 33–38 × 21–24 µm in size. Their stalk is colorless and 30–45 µm long.
distribution
The known distribution area of Uropyxis nissoliae extends from Mexico to El Salvador .
ecology
The host plants of Uropyxis nissoliae are diverse Nissolia 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 with Spermogonia, Aecien, Telien and Uredien. 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 .