Prob sOr (ORKNEY MOSSES 
RVie% TEl;) 
INTRODUCTION. 
OR the information of the general reader, I 
may explain that the British Isles, excluding 
Treland, are for Bryological purposes divided into 
112 Vice-Counties and 18 Provinces. The Outer 
Hebrides (V.C. 110), the Orkneys (V.C. 111), and the 
Shetlands (V.C. 112), form the North Isles Province 
(P. XVIII), because from their physical characteristics 
being similar, their moss floras would be identical, 
and of the lowland type. 
The mosses in this list were gathered by me in 
the West Mainland of Orkney and in the islands 
of Hoy, Gremsay, and Flotta (V.C. 111). Additional 
records and their sources are given in the supple- 
ment. The arrangement of the list follows that of 
the “Census Catalogue of British Mosses,” published 
