REFERENCES
- Alcock, M. R. & Morton, A. J. (1985). Nutrient content of throughfall and stem-flow in woodland recently established in heathland. J. Ecol. 73, 625–632.
- Allen, S. E. (1974). Chemical Analysis of Ecological Materials. Oxford.
- Bates, J. W. (1978). The influence of metal availability on the bryophyte and macro-lichen vegetation of four rock types on Skye and Rhum. J. Ecol. 66, 457–482.
- Bates, J. W. (1979). The relationship between physiological vitality and age in shoot segments of Pleurozium schreberi (Brid.) Mitt. J. Bryol. 10, 339–351.
- Bates, J. W. (1982). The role of exchangeable calcium in saxicolous calcicole and calcifuge mosses. New Phytol. 90, 239–252.
- Bates, J. W. (1987). Nutrient retention by Pseudoscleropodium purum and its relation to growth. J. Bryol. 14, 565–580.
- Bates, J. W. & Brown, D. H. (1974). The control of cation levels in seashore and inland mosses. New Phytol. 73, 483–495.
- Brown, D. H. (1982). Mineral nutrition. In: A. J. E. Smith (ed.) Bryophyte Ecology, pp. 383–444. Chapman & Hall, London & New York.
- Brown, D. H. (1984). Uptake of mineral nutrients and their use in pollution monitoring. In: A. F. Dyer & J. G. Duckett (eds), Experimental Biology of Bryophytes, pp. 229-255. Academic Press, New York. Brown, D. H. & Buck, G. W. (1979). Desiccation effects and cation distribution in bryophytes. New Phytol. 82, 115–125.
- Buck, G. W. & Brown, D. H. (1978). Cation analysis of bryophytes: the significance of water content and ion location. Bryophyt. Biblioth. 13, 735–750.
- Carlisle, A., Brown, A. H. F. & White, E. J. (1966). The organic matter and nutrient elements in the pre-cipitation beneath a sessile oak (Quercus petraea) canopy. J. Ecol. 54, 87-98.
- Chapin, F. S., Oechel, W. C., Van Cleve, K. & Lawrence, W. (1987). The role of mosses in the phos-phorus cycling of an Alaskan black spruce forest. Oecologia (Berlin) 74, 310–315.
- Clymo, R. S. (1963). Ion exchange in Sphagnum and its relation to bog ecology. Ann. Bot. 27, 309–324.
- Farrar, J. F. (1976). The uptake and metabolism of phosphate by the lichen Hypogymnia physodes. New Phytol. 77,127–134.
- Grubb, P. J., Flint, O. P. & Gregory, S. C. (1969). Preliminary observations on the mineral nutrition of epiphytic mosses. Trans. Br. bryol. Soc. 5, 802–817.
- Mickiewicz, J. (1976). Influence of mineral fertilisation on the biomass of moss. Polish Ecological Studies 2,57–62.
- Parker, G. G. (1983). Throughfall and stemflow in the forest nutrient cycle. Adv. Ecol. Res. 13, 57–133.
- Raeymaekers, G. (1987). Effects of simulated acidic rain and lead on the biomass, nutrient status, and heavy metal content of Pleurozium schreberi (Brid.) Mitt. J. Hattori bot. Lab. 63, 219–230.
- Raeymaekers, G. & Glime, J. M. (1986). Effects of simulated acidic rain and lead interaction on the phenology and chlorophyll content of Pleurozium schreberi (Brid.) Mitt. J. Hattori bot. Lab. 60, 525-541.
- Rieley, J. O., Richards, P. W. & Bebbington, A. D. L. (1979). The ecological role of bryophytes in a North Wales woodland. J. Ecol. 67, 497–527.
- Rühling, Å. & Tyler, G. (1970). Sorption and retention of heavy metals in the woodland moss, Hylocomium splendens (Hedw.) Br. et Sch. Oikos 21, 92–97.
- Skre, D. and Oechel, W. C. (1979). Moss production in a black spruce Picea rnariana forest with perma-frost near Fairbanks, Alaska, as compared with two perma-frost-free stands. Holarctic Ecology 2, 249–254.
- Streeter, D. T. (1965). Seasonal variations in the nutrient content of carpets of Acrocladium cuspidatum (Hedw.) Lindb. Trans. Br. bryol. Soc. 4, 818–827.
- Tamm, C. O. (1953). Growth, yield and nutrition in carpets of a forest moss (Hylocomium splendens). Meddel. Stat. Skogsforskn. 43, 1–140.
- Tanaka, R. & Sato, S. (1977). Polyphosphate body in the chloroplast of Pogonatum inflexum, Musci. Cytologia 42, 383–387.
- Wells, J. M. & Brown, D. H. (1987). Factors affecting the kinetics of intracellular and extracellular cadmium uptake by the moss Rhytidiadelphus squarrosus. New Phytol. 105, 123–137.
- Wells, J. M. & Richardson, D. H. S. (1985). Anion accumulation by the moss Hylocomium splendens: uptake and competition studies involving arsenate, selenate, selenite, phosphate, sulphate and sulphite. New Phytol. 101, 571–583.
- Woodin, S., Press, M. C. & Lee, J. A. (1985). Nitrate reductase activity in Sphagnum fuscum in relation to wet deposition of nitrate from the atmosphere. New Phytol. 99, 381–388.
- J. W. BATES, Department of Pure and Applied Biology, Imperial College at Silwood Park, Ascot,Berkshire SL5 7PY.