Lodenius M, Kumpulainen J
Sci Total Environ. 1983 Dec 15;32(1):81-5. doi: 10.1016/0048-9697(83)90135-3.
The epiphytic lichen Hypogymnia physodes was analysed for its content of cadmium, iron and zinc in a suburb of Helsinki. The metal contents were slightly higher than those from unpolluted areas in central Finland. Elevated concentrations were found in the vicinity of a big shipyard.