Sixty-nine taxa are reported from Istria, one of which is new to Jugoslavia, viz.: Collema furfureolum Müll. Arg. and four are new to Croatia, viz.: Cetrelia olivetorum. (Nyl.) Culb. et C. Culb., Lecanora chlarotera Nyl., Physconia perisidiosa (Erichs.) Moberg, and Xanthoria fallax (Hepp) Arn. Thirty- -one taxa are new to Istria. Epiphytic lichen communities are shortly discussed.