Valladares, F 1994: Form-functional trends in Spanish Umbilicariaceae with special reference to water relations. - Cryptogamie, Bryologie-Lichénologie15(2): 117-127. [RLL List # 156 / Rec.# 19241] Keywords: AEROHYGROPHYTIC/ CILIA/ CORTEX/ ESQUIZIDIA/ ISIDIA/ MEDULLA/ PUSTULES/ RHIZOMORPHS/ SPAIN/ UMBILICARIA/ WATER RELATIONS
Abstract: 9 fig. ["Two principal form-functional trends were observed on water relations, depending on the physical state of water available: 1) a little-porous upper surface combined with rhizinomorphs when uptake is as liquid water or 2) a highly hygroscopic upper surface with no rhizinomorphs on the lower surface when the water uptake is as vapour."]