Lange, OL/ Reichenberger, H/ Meyer, A 1995: High thallus water content and photosynthetic CO2 exchange of lichens. Laboratory experiments with soil crust species from local xerothermic steppe formations in Franconia, Germany. - In: Daniëls, FJA/Schulz, M/Peine, J (eds.): Flechten Follmann. Contributions to lichenology in Honour of Gerhard Follmann. . Geobotanical and Phytotaxonomical Study Group, Botanical Institute, University of Cologne, Cologne pp. 139-153. [RLL List # 161 / Rec.# 11042] Keywords: PHOTOSYNTHESIS/ SOIL CRUSTS/ THALLUS HYDRATION/ WATER CONTENT/ WATER RELATIONS
Abstract: 5 fig. [Study of net photosynthesis and its dependence on thallus water content in seven lichens. "The relationships found between NP and WC could be divided into four response types based on the degree of depression of NP at maximal WC. Type A lichens (Cladonia convoluta, Diploschistes muscorum) showed no or almost no depression, type B (Squamarina lentigera) only a little at the highest thallus water contents. Type C (Collema tenax, Toninia sedifolia) had a large depression which became steadily greater as water content increased; type D lichens Cladonia pocillum, Fulgensia fulgens) behaved similarly, but the response curve had an inflection so that NP became low but almost constant."]