R. Reiter, T. G. A. Green, B. Schroeter and R. Türk 2007: Photosynthesis of three Umbilicaria species from lichen-dominated communities of the alpine/nival belt of the Alps measured under controlled conditions. - Phyton (Austria)46(2): 247-258. [RLL List # 209 / Rec.# 29705] Keywords: UMBILICARIA/ PHOTOSYNTHESIS/ ALPINE/ NIVAL BELT/ PHYSIOLOGY/ GAS EXCHANGE