Isolates included
A total of 36 dikaryotic isolates were included in the analyses, 18 from Japan, 16 from Europe (France, Germany, Norway, Poland, UK) and 2 from New Zealand (Table 1). Southern France isolates M1 and M2 were collected from different parts of the same building. French and Japanese isolates were kindly provided by Dr. G. Le Floch, University of Brest, France and Dr. Sakae Horisawa, Kochi University of Technology, Japan, respectively.