Phoma exigua var. inoxydabilis var. nov. predominated among fungal isolates obtained from diseased stem runners and leaves of periwinkle (Vinca minor). The growth of the fungus was observed at temperaturę ranges from 7.5 to 30°C with optimum at 25°C. Abundant formation of picnidia was noticed mainly on malt extract agar at temp. 15-25°C. On potato-dextrose agar picnidia were observed 3-5 days later. On inoculated leaves of periwinkle, development of necrosis was observed at temperature 10-25°C with optimum 20°C. On field grown periwinkle the first necrosis on the base of stem runners was observed 2 weeks after inoculation and during the next 10 weeks discoloration of tissues occurred on about 1/2 of their length.