Uromyces hordeinus
| Uromyces hordeinus | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Uromyces hordeinus | ||||||||||||
| ( Arthur ) Bartholomew |
Uromyces hordeinus is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the hybrid leek Nothoscordum bivalve as well as of various sweet grasses . 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 the United States .
features
Macroscopic features
Uromyces hordeinus 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 Uromyces hordeinus grows as with all Uromyces TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The gregariously growing, cup-shaped aecia of the species have 23-27 × 19-23 µm, spherical to ellipsoidal, hyaline aeciospores with a warty surface. The yellow-orange uredia of the fungus grow on both sides of the host leaves. Their yellowish to light gold uredospores are 26–30 × 21–25 µm in size, mostly broad ellipsoid and spiky. The teliae of the species growing on both sides and on fescue are blackish and covered, which usually have numerous paraphyses. The brown teliospores are unicellular, usually ovoid to long ellipsoid and 26–34 × 17–23 µm in size. Their stalk is yellowish and up to 25 µm long.
distribution
The known distribution area of Uromyces hordeinus extends from Virginia , Nebraska , Texas to Colorado .
ecology
The host plants of Uromyces hordeinus are for haplonts bivalve Nothoscordum and Hordeum pusillum , H. brachyantherum , Scribnera bolanderi and Festuca actoflora for dikaryotic . 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 development cycle with spermogonia, Aecien, Telien and Uredien and completes a host change .
literature
- George Baker Cummins: The Rust Fungi of Cereals, Grasses and Bamboos . Springer, Berlin 1971, ISBN 3-540-05336-0 .