AbstractGrowth rates were obtained for four mosses associated with tufa deposits. Rates per annum were as follows:Cratoneuron commutatumvar.commutatum,1–4 mm;Eucladium verticillatum,2–3 mm;Gymnostomum recurvostrum,1–3;Rhynchostegium riparioides, ca30 mm. The results are discussed with reference to tufa deposition, water chemistry and water flow. A method for identifying bryophyte remains in postglacial tufa is also described.