Uropyxis farlowii
Uropyxis farlowii | ||||||||||||
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Systematics | ||||||||||||
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Scientific name | ||||||||||||
Uropyxis farlowii | ||||||||||||
( Arthur ) Baxter |
Uropyxis farlowii is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the legume Dalea domingensis . 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 and the Caribbean .
features
Macroscopic features
Uropyxis farlowii 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 Uropyxis farlowii grows as with all Uropyxis intercellular types, and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow in large numbers on the host stalks. 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 parts of the species growing on stems are cinnamon-brown, powdery, confluent and uncovered. The cinnamon-brown teliospores are two-celled and double-walled, usually ellipsoidal, spiny and usually 30–38 × 20–24 µm in size. Its stalk is colorless and swollen apically.
distribution
The known distribution area of Uropyxis farlowii includes Cuba and Mexico .
ecology
The host plant of Uropyxis farlowii is Dalea domingensis . 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 .