Acknowledgments.

The preparation of this paper has only been possible by reason of the assistance so ungrudgingly given by Mr. G. O. K. Sainsbury, Mrs. E. A. Hodgson, and Dr. H. H. Allan with the mosses, hepatics, and lichens respectively. Indeed, all the liverworts and lichens mentioned have been identified by the above authorities. As the paper is concerned with the mosses in particular, unknown and doubtful species have been referred to Mr. Sainsbury for identification or verification; and it is true to say that without his help and criticism this paper could scarcely have been attempted. All field notes and observations are my own, and for the accuracy of these I take full responsibility.