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 In the "Appendix" will be found a few omitted species, and alterations of nomenclature, as well as a few errata, which should be noted in the margin at their proper places.

I much regret that, by an oversight, I have omitted to insert var. δ squarrosulum under Sphagnum cymbifolium, gathered by my friend Mr. Bagnall, in Sutton Park, Birmingham; and the same locality should be added after Hypnum aduncum, H. Sendtneri, and H. intermedium.

I must here express my gratitude and thanks to those gentlemen who have so kindly assisted me in its preparation, both with the loan or gift of specimens of the rarer and newer species, and also for the diagnoses received from several, where specimens were not attainable. Amongst these gentlemen I must specially thank Dr. Hooker for his kind permission to use the Herbarium specimens and Library at Kew, and Mr. J. G. Baker, F.L.S., for his valuable assistance in doing so; also Dr. Braithwaite, F.L.S., Mr. J. Bagnall, of Birmingham; Dr. F. Buchanan White, of Dunkeld; Dr. Fraser, of Wolverhampton; Rev. J. Fergusson, of New Pitsligo; Mr. Carruthers, F.L.S., of British Museum; Mr. G. E. Hunt, of Manchester; Mr. John Sim, of Strachan; Mr. W. Galt, of Edinburgh; M. P. Goulard, of Caen, Calvados; and lastly, all those gentlemen and ladies who so readily came forward as subscribers to the number of upwards of 200, to assist in the publication of the volume.

CHAS. P. HOBKIRK.

, February, 1873.