Uredo hyperici-humifusi
| Uredo hyperici-humifusi | ||||||||||||
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| Uredo hyperici-humifusi | ||||||||||||
| Klebahn |
Uredo hyperici-humifusi is a stand fungal art from the order of the rust fungi (Pucciniales). The fungus is an endoparasite of the Lower St. John's Wort ( Hypericum humifusum ). Symptoms of the infestation by the species are rust spots and pustules on the leaf surfaces of the host plants. It is common in Central Europe. Since only its secondary crop shape is knownso far, it is classified in the genus Uredo .
features
Macroscopic features
Uredo hyperici-humifusi 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 Uredo hyperici-humifusi grows as with all Uredo TYPES intercellular and forms Saugfäden that grow into the storage tissue of the host. The spermogonia and aecia of the species are not known. The uredia of the fungus growing on the underside of the host leaves are rounded and initially covered. Their uredospores are on average 18–21 × 14–16 µm in size, mostly oval to angular-oblong and warty. The parts of the species are unknown.
distribution
The known distribution area of Uredo hyperici-humifusi includes Central Europe .
ecology
The host plant of Uredo hyperici-humifusi is the prostrate St. John's wort ( Hypericum humifusum ). 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 presumably macrocyclical development cycle with Spermogonia, Aecien, Uredien and Telien. Due to the lack of aecia and spermogonia, it is not possible to determine whether it changes host .
literature
- Ernst Gäumann: The rust fungi of Central Europe. With special consideration of Switzerland . In: Contributions to the cryptogam flora in Switzerland . tape 12 . Commission publisher Buchdruckerei Büchler & Co, Bern 1959.