Kappen, L/ Schroeter, B/ Green, TGA/ Seppelt, RD 1998: Chlorophyll a fluorescence and CO2 exchange on Umbilicaria aprina under extreme light stress in the cold. - Oecologia113(3): 325-331. [RLL List # 171 / Rec.# 9781] Keywords: CHLOROPHYLL/ CO2 EXCHANGE/ FLUORESCENCE/ LIGHT/ TEMPERATURE/ UMBILICARIA
Abstract: 5 fig. [Simultaneous field measurements of CO2 exchange and chlorophyll a fluorescence indicate no photoinhibition when the lichen was exposed to strong sun irradiance for nearly 11 hours a day.]