"The exact origin of the culture in the 1960s is not known. It certainly was being sold in England by the commercial dealer trading as ‘Worldwide Butterfl ies’ at Yeovil in Somerset.
However, several subsequent importations are known.
Stock 2 from northern France by Stan Pack in the 1980s.
Stock 3 from southern France by M.Cooper in the 1980s.
Stock 4 from Sardinia, Giara de Gesturi by Paul Brock in April 1982.
Stock 5 from former Yugoslavia, Lanterna nr Porec by Paul Brock in June 1983.
Stock 6 from Italy nr Pisa by M.Brückner in the 1990s.
Stock 7 from Italy nr Genova, Via Vesuvio at 205m (675 ft) ‘on bramble’ by Frank Hennemann and
Oskar Conle in September 1998.
Stock 8 from Sardinia, Aritzo at 350m (1150 ft) via Frank Hennemann and Oskar Conle in 2003." (Harman, 2011; 6)
Harman. 2011. PSG Newsletter 125:6