Nobel P. S., Hartsock T. L., Diel patterns of CO₂ exchange for epiphytic cacti differing in succulence, Physiologia Plantarum, 1990, 78(4):628-634, doi: 10.1111/j.1399-3054.1990.tb05252.x
Daily gas exchange measurements in six epiphytic cacti differing in stem succulence. The proportion of nocturnal CO₂ uptake covaried with water-storage traits. Light responses were examined in Schlumbergera truncata and the historically named Rhipsalis houlletiana, and responses to short-term water deficit in R. rhombea.