Puccinia parthenii
| Puccinia parthenii | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Puccinia parthenii | ||||||||||||
| ( Speg. ) Arthur |
Puccinia parthenii is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the daisy family Parthenium argentatum . 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 parthenii can only be recognized with the naked eye by means of the spore beds emerging 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 parthenii grows as with all Puccinia TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Their spermogonia and aecia are unknown. The uredia growing on both sides of the mushroom are dark cinnamon brown. Their cinnamon-brown uredospores are 28–40 × 22–28 µm in size, mostly ovoid to broadly ellipsoidal and spiny. The branches of the species growing on both sides and on stems are black-brown, compact to powdery and uncovered, they have golden paraphyses. The chestnut-brown teliospores are one- to two-celled, usually broadly ellipsoid and 44–56 × 27–35 µm in size. Their stem is colorless and up to 85 µm long.
distribution
The known distribution area of Puccinia parthenii extends from South America to the southern USA .
ecology
The host plant of Puccinia parthenii is Parthenium argentatum . 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 of which only Telien and Uredien and their host are known so far; Spermogonia and Aecien could not be assigned to her.
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .