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| Author(s) [A-Z] | Year [ascending] | Title | Type | Journal | Citation |
| Phillips, W.H. | 1900 | British ferns | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Phillips, W.H. | 1901 | My hobby about ferns and its results: personal reminiscences | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Phillips, W.H. | 1904 | Varieties in British ferns | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Phillips, W.H. | 1906 | Reproduction in ferns | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Phillips, W.H. | 1907 | A talk about some beautiful varieties of ferns | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Phillips, W.H. | 1910 | The ferns of Ulster: how to grow, and where to find them | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Phillips, W.H. | 1910 | The crossing of ferns. Reminiscences of some pioneers of the cult | Journal | Proc. Belf. Nat. Fld. Club | Details... |
| Phillips, W.H. & Praeger, R.Ll. | 1887 | The Ferns of Ulster | Appendix | Proc. Belf. Nat. Fld. Club | Details... |
| Picton, B.E. | 1990 | The sublittoral communities of Rathlin Island, Northern Ireland | Journal | PMNHS Newsletter | Details... |
| Picton, B.E., Emblow, C.S., Morrow, C.C., Sides, E.M. & Costello, M.J. | 1994 | Marine communities of the Mulroy Bay and Lough Swilly area, north-west Ireland, with an assessment of their conservation importance | Report | | Details... |
| Pieroni, A. | 1999 | Gathered wild food plants in the Upper valley of the Serchio River (Garfagnana), Central Italy | Journal | Econ. Bot. | Details... |
| Pignatti, S. (ed) | 1997 | Flora d'Italia | Book | | Details... |
| Pigott, C.D. | 1964 | Nettles as indicators of soil conditions | Magazine article | New Sci. | Details... |
| Pigott, C.D. & Taylor, K. | 1964 | The distribution of some woodland herbs in relation to the supply of nitrogen and phosphorus in the soil | Supplement | J. Ecol. | Details... |
| Pigott, D. | 2003 | Is small-leaved lime native in Scotland or Ireland? | Journal | BSBI News | Details... |
| Pilcher, B. | 1967 | The algae of John Templeton in the Ulster Museum | Journal | Ir. Nat. J. | Details... |
| Pilcher, J. | 1999 | Review: 'Wild plants of the Burren and the Aran Islands' by C. Nelson | Journal | Ir. Nat. J. | Details... |
| Pilcher, J.R. | 1979 | Application of dendrochronological techniques to the investigation of woodland history | Journal | Ir. Nat. J. | Details... |
| Pilcher, J.R. | 1986 | Review: 'History of the British Flora , a factual basis for phytogeography' by Sir H. Godwin | Journal | Ir. Nat. J. | Details... |
| Pilcher, J.R. & Gray, B. | 1982 | The relationship between oak tree growth and climate in Britain | Journal | J. Ecol. | Details... |
5058 references found.