REFERENCES
- Armitage, E. (1900). Denbighshire mosses. J. Bot., Lond. 38, 78–80.
- Arts, T. (1987). The occurrence of rhizoidal tubers in Atrichum tenellum (Rohl) B. & S. and A. crispum (James) Su11. Lindbergia 13, 72–74.
- Atkinson, B. W. & Smithson, P. A. (1976). Precipitation. In: T.J. Chandler & S. Gregory (eds), The Climate of the British Isles, pp. 129–182. Longman, London.
- Blackstock, T. H. (1987). The male gametophores of Leucobryum glaucum (Hedw.) Angstr. and L. juniperoideum (Bud.) C. Muell. in two Welsh woodlands. J. Bryol. 14, 535–541.
- Blockeel, T. L. (1987). New vice-county records and amendments to the Census Catalogues. Musci. Bull. Br. bryol. Soc. 50, 20–26.
- Corley, M. F. V. & Hill, M. O. (1981). Distribution of Bryophytes in the British Isles. British Bryological Society, Cardiff.
- Condry, W. (1967). The Snowdonia National Park, edn 2. Collins, London.
- Condry, W. (1981). The Natural History of Wales. Collins, London.
- Crundwell, A. C. & Nyholm, E. (1964). Amblystegium saxatile Schimp. in Cornwall, new to the British Isles. Trans. Br. bryol. Soc. 4, 638–641.
- Dallman, A. A. (1907-8). Notes on the flora of Flintshire. J. Bot., Lond. 45, 138-153,46, 187-196,46, 222-230.
- Davies, H. (1813). Welsh Botanology. London.
- Dickson, J. H. (1973). Bryophytes of the Pleistocene. Cambridge.
- Edwards, M. E. (1986). Disturbance histories of four Snowdonian woodlands and their relation to atlantic bryophyte distribution. Biol. Conserv. 37, 301–320.
- Edwards, M. E. & Birks, H. J. B. (1986). Vegetation and ecology of four western oakwoods (Blechno- Quercetum petraeae Br.-B1. et Tx. 1952) in North Wales. Phytocoenologia 14, 237–261.
- Ellis, R. G. (1983). Flowering Plants of Wales. National Museum of Wales, Cardiff.
- George, T. N. (1961). British Regional Geology, North Wales, edn 3. H.M.S.O., London.
- Griffith, J. E. (1895). The Flora of Anglesey and Caernarvonshire. Bangor.
- Hill, M. O. (1983). Effects of grazing in Snowdonia. Ann. Rep. Inst. Terr. Ecol. 1982, 31–32.
- Jones, E. W. (1971). The sexual organs of Cephaloziella pearsonii (Spruce) Douin. Trans. Br. bryol. Soc. 6, 225–227.
- Meteorological Office (1952). Climatological Atlas of the British Isles. H.M.S.O., London.
- North, F. J. (1949). Geology and the physical background. In: F. J. North, B. Campbell & R. Scott, Snowdonia: The National Park of North Wales, pp. 1-156. Collins, London.
- Paton, J. A. (1984). Cephaloziella nicholsonii Douin & Schiffn. distinguished from C. massalongi (Spruce) K. Mue11. J. Bryol. 13, 1–8.
- Pentecost, A. (1980). The lichens and bryophytes of rhyolite and pumice-tuff rock outcrops in Snowdonia, and some factors affecting their distribution. J. Ecol. 68, 251–267.
- Pentecost, A. (1987). The lichen flora of Gwynedd. Lichenologist 19, 97–166.
- Ranwell, D. S. (1959). Newborough Warren, Anglesey. I. The dune system and dune slack habitat. J. Ecol. 47, 571–601.
- Ratcliffe, D. A. (1968). An ecological account of Atlantic bryophytes in the British Isles. New Phytol. 67, 365–439.
- Richards, P. W. (1963). Campylopus introflexus (Hedw.) Brid. and C. polytrichoides De Not, in the British Isles; a preliminary account. Trans. Br. bryol. Soc. 4, 404–417.
- Richards, P. W. (1979). A note on the bryological exploration of North Wales. In: G. C. S. Clarke & J. G. Duckett (eds), Bryophyte Systematics, pp. 1–9. Academic Press, London.
- Richards, P. W. & Smith, A. J. E. (1975). A progress report on Campylopus introf1exus (Hedw.) Brid. and C. polytrichoides De Not. in Britain and Ireland. J. Bryol. 8, 293–298.
- 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.
- Savidge, J. P. (1983). The effect of climate, past and present, on plant distribution in Wales. In: R. G. Ellis, Flowering Plants of Wales, pp. 18-32. National Museum of Wales, Cardiff.
- Schumacker, R. & de Zuttere, P. (1982). Sematophyllum demissum (Wils.) Mitt. (Musci), espece nouvelle pour la bryoflore beige. Etude critique de sa repartition en Europe. Bull. Soc. Roy. Bot. Belg. 115, 14–22.
- Tallis, J. H. (1958). Studies in the biology and ecology of Rhacomitrium lanuginosum Brid. I. Distribu- tion and ecology. J. Ecol. 46, 271–288.
- Tallis, J. H. (1959). Studies in the biology and ecology of Rhacomitrium lanuginosum Brid. II. Growth, reproduction and physiology. J. Ecol. 47, 325–350.
- Taylor, F. J. (1954). Bryophyte county floras. I. The Channel Islands, England and Wales. Trans. Br. bryol. Soc. 2, 446–457.
- Taylor, J. A. (1976). Upland climates. In: T. J. Chandler & S. Gregory (eds), The Climate of the British Isles, pp. 264–287. Longman, London.
- Turner, D. & Dillwyn, L. W. (1805). The Botanist's Guide through England and Wales. Vol. 1 & 2. London.
- Wilson, A. (1947). The flora of a portion of north-east Caernarvonshire. Northwest. Nat. 22, 191–211.
- Yarranton, G. A. (1962). Bryophyte communities of the exposure of Breidden Hill (North Wales). Rev. biyol. lichen. 31, 168–186.