Aecidium columbiense
| Aecidium columbiense | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Aecidium columbiense | ||||||||||||
| Ellis & Everh. |
Aecidium columbiense is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is a endoparasite the Korbblütlergattung Hieracium . 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 . Since only its secondary crop form is knownso far, it is classified in the genus Aecidium .
features
Macroscopic features
Aecidium columbiense 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 Aecidium columbiense grows as with all Aecidium TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. Its spermogonia grow on both sides and densely on the host leaves. The aecia of the species on the underside of the leaves are pale yellowish and cup-shaped. Their hyaline aecidiospores are 18–21 × 16–20 µm in size, spherical and warty. The uredia of the mushroom are not known, and it is possible that they are not developed. The Telien the type have not been observed to date.
distribution
The known range of Aecidium columbiense includes North America from British Columbia to New York City and California .
ecology
The host plants of Aecidium columbiense are different Hieracium 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 micro- or macrocyclical development cycle with spermogonia, aecia and telia and possibly also uredia. Whether she is going through a change of host cannot be determined due to the lack of telien and uredien.
literature
- George Baker Cummins : Rust Fungi on Legumes and Composites in North America . University of Arizona Press, Tucson 1978, ISBN 0-8165-0653-1 .