Listed as Pinus mugo ‘Xenie # 24 WB’ in American trade at times, Robert L. Fincham further says: “The correct name is Pinus uncinata ‘Xenie’. The rest of the name indicates it was the 24th witches broom of a series collected in the San Sebastian region of northern Bohemia. Milan Halada discovered a marshy area with many specimens of Pinus x pseudopumilio, a hybrid of Pinus mugo and Pinus uncinata. He collected wood from a witches -broom known as San Sebastian #13, which he named ├ö├Â┬ú├ö├╗├┤├ö├Â┬╝Ôö¼┬╝ Adam . Since then, he and a friend, Jan Beran, have returned many times and collected a variety of witches -brooms in this area. These are found throughout Europe and America as the San Sebastian Series.” (November 2, 2006)
Furthermore, Taxonimist M.P. Frankis cites in this link (http://www.conifers.org/pi/pin/uncinata.htm) that the first recorded name for the nomenclature of P. uncinata is: Pinus mugo subsp. uncinata thus taking over precedence of any conifer currently being named as P. uncinata.