SUMMARYIn two open, flow-through systems 11 lichen species were fumigated with concentrations between 0-036 and 2-0 ppm {c. 94-3-5240//^g m~^) SOg. Sulphur dioxide uptake was monitored concurrently as a mass balance between incoming and outgoing SOg concentrations. The rate of uptake ranged from 0-025 (±0-006) to 0-7 (±0-16) nmol SO^ g"^ d. wt s~\ for all species. After the first hour of fumigation the uptake rate was almost constant during the following 5 h for concentrations up to 1-0 ppm SOg. At higher concentrations the uptake declined over time continuously. Within the range of measured SOg concentrations the uptake rate was linearly correlated with SO^ concentrations (r^ = 0-90). Thalli which were killed by heat treatment or in which respiration was inhibited by azide treatment did not show significantly different SOg uptake from living thalli. No differences in uptake were found during fumigation in the light versus in the dark.
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