Uropyxis amorphae
| Uropyxis amorphae | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Uropyxis amorphae | ||||||||||||
| ( MA Curtis ) J. Schröt. |
Uropyxis amorphae is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the legume genera Amorpha and Parryella . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in North America .
features
Macroscopic features
Uropyxis amorphae 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 amorphae grows as with all Uropyxis intercellular types, and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia usually 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 yellowish aeciospores are 21–26 × 15–19 µm in size, ovate to broadly ellipsoidal and spiky. The uredia of the fungus, growing on both sides or on the underside, are yellow-brown and framed by paraphyses. 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 chestnut-brown teliospores are two-celled, usually broad ellipsoid, warty and usually 40–46 × 30–35 µm in size.
distribution
The known distribution area of Uropyxis amorphae extends from southern Canada to the south of the USA .
ecology
The host plants of Uropyxis amorphae are various Amorpha and Parryella 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 .