ASW, 20 gl−¹ agar. Strains which remained sterile were
further cultivated using the ` balsa broth shake culture
technique ' (Hyde, Farrant & Jones 1987).
Cultures from which secondary metabolites were isolated
are being deposited in DSMZ (Braunschweig). Others are in
the collections of the Technical University of Braunschweig
and the University of Bonn.