Eversman, S 1978: Effects of low-level SO2 on Usnea hirta and Parmelia chlorochroa. - The Bryologist81: 368-377. [RLL List # 101-31 / Rec.# 5347] Keywords: USNEA/ AIR POLLUTION/ SO2/ PARMELIA/ XANTHOPARMELIA/ MONTANA/ RESPIRATION/ PHYCOBIONT
Abstract: 1 table. 11 figures. [Field study conducted in Powder River County, Montana. Respiration rates significantly decreased in exposed organisms and 100% of algal cells were plasmolyzed in 60 days. U. hirta was more sensitive than P. chlorochroa, and the lichens were damaged faster than the adjacent vascular plant vegetation.]
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