Puccinia subdecora
| Puccinia subdecora | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia subdecora | ||||||||||||
| Sydow , P. Sydow & Holway |
Puccinia subdecora is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Brickellia grandiflora . Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in the western United States .
features
Macroscopic features
Puccinia subdecora 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 Puccinia subdecora grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia grow on both sides of the surface of the host leaves and on stems. The aecia of the species grow around the spermogonia and are dark brown. Their cinnamon-brown aeciospores are 25–30 × 20–25 µm in size, ovate to long ellipsoid and warty. The bilateral uredia of the fungus are scattered and otherwise resemble the aecia. The parts of the species growing underneath the leaves are chocolate brown, powdery and uncovered. The dark chestnut-brown teliospores are two-celled, usually ellipsoidal to ovate, wrinkled and mostly 30–44 × 18–28 µm in size. Their stem is colorless and up to 30 µm long.
distribution
The known distribution area of Puccinia subdecora includes the American Rocky Mountains from Wyoming to California .
ecology
The host plant of Puccinia subdecora is Brickellia grandiflora . 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 a self-sufficient 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 .