Image of dimple lichen

Description:

Slo.: - ? - Habitat: Stony wall of a bridge across a water stream, 2 m (6 feet) above water level, N faced, humid and shady place, precipitations 3.000 mm/year, average temperature 8-10 deg C, altitude 450 m (1.500 feet), alpine phytogeographical region. Substratum: vertical and over hanged calcareous rock