This was due to presence of an extra restiction site i a band of about 810 bp in pattern A, being split in to bands of about 610 and 195 bp in pattern B. Comparison of SSU sequence H. werneckii, CBS 107.67 showed that this site must be located in the SSU variable domain V3, which shows considerably more variation than the rest of molecule (Sterflinger et al., 1999). The RFLP difference is demonstrated in the restiction map giving in the plate 1.