As "boulders" colloquially wild and initially unknown grape varieties are designated whose origin is unclear (see also under openly bloomed ). The name is also used as a name for at least three different white grape varieties.
1) A variety called "foundling" is listed in the variety register of Germany. It acts according to DNA analysis but not an independent variety, but the variety grown in Austria in larger quantities Bouvier (personal information from Dr. Erika Maul vom Julius Kühn Institute ). She finished in 2010, a total of 27 hectares of vineyards, especially in the two growing areas to bathe and Moselle,
2) Another variety known as foundling was found by breeder Franz Kimmig in Oberkirch (Baden, Germany) in 1971, selected and propagated. This is a mutation of Müller-Thurgau; a DNA determination has not yet taken place. The differences are earlier Maturity date, lower yield and higher Mostgewicht, It is in small quantities in the Swiss canton Geneva cultivated (personal information of Dr. José Vouillamoz ); Whether there are stocks in Germany is not known.
3) The variety "Foundling of Muhen" with a dark red berry color comes from the Switzerland (Muhen is a municipality in the district of Aarau in the canton Aargau with the parts underneath, mid-loins and upper loins). The fantasy name, however, does not yet have ampelographic validity. It was found by a Swiss amateur ampelographer. The vine has an independent DNA profile, which differs from Müller-Thurgau. The parentage is unknown (Dr. José Vouillamoz).