ANION ACCUMULATION BY LICHENS I. THE CHARACTERISTICS AND KINETICS OF ARSENATE UPTAKE BY UMBILICARIA MUHLENBERGII

S ummary Arsenate was accumulated by discs of the lichen Umbilicaria muhlenbergii (Ach.) Tuck, to levels of 16/wnol As per gram oven‐dry weight during 1 h incubation in solutions containing 40μmol of arsenate at pH 4–6. Studies at lower external concentrations and at different pH values revealed that the more protonated species of arsenate were absorbed most readily. Light enhanced arsenate uptake only marginally, which supports the …