Bailey, C/ Larson, DW 1982: Water quality and pH effects on Umbilicaria mammulata (Ach.) Tuck. - The Bryologist85: 431-437. [RLL List # 117-4 / Rec.# 1384] Keywords: UMBILICARIA/ PH/ WATER RELATIONS/ ECOLOGY/ SAXICOLOUS
Abstract: 4 figures. 3 tables. ["These results suggest that the duration and frequency of precipitation is of far greater consequence to this plant in the field than is the pH or water quality of the rain itself."]