In West as well as in East Java a Cyanophyceae association has been found, that from both localities shows a remarkable similarity in composition. Both were growing on limestone rocks and had the same greyish velvety appearance. The localities are: West Java, Koeripan near Buitenzorg, alt. ± 200 m (LüTJEHARMS n. 5461, 4 VII 1936) and East Java, Malang, South coast, South of Wlingi near kampong Nglijep, alt. 0—500 m (GROENHART s.n., 4 X 1936). The principal components are: Scytonema Hofmanni AG., Schizothrix chalybea (KüTZ.) GOM. and less frequent Scytonema (Petalonema) crassum NAEG.