108 ORKNEY MOSSES. 
in 1907. Omissions in the sequences of the numbers 
in the list bear reference to the numbers recorded in 
the Catalogue which have not, within my knowledge, 
been found in Orkney. Probably some of these 
blanks may be filled’ by careful exploration in 
woods and in hilly situations. I have stated the 
localities of plants which I found were more or less 
rare in my limited areas of investigation. Drainage 
is influencing the frequency of some of the water- 
loving species. Climacium dendroides—a fine, tree- 
like plant—lately found growing in three localities 
in Stromness, is now, from the cause stated, reduced 
to its last bog, west of the mouth of Garson Burn. 
Additions by immigration may also occur. In the 
month of January last I found Barbula Hornschucha- 
ana and Amblystegium Juratzkanwm, both probably 
introduced, growing on the pier at Ness, Stromness. 
The previous furthest north recorded station for the 
first-named plant was East Perth (V.C. 96), and for 
the last-named Easter-Ness and Nairn (V.C. 89). 
I have to thank those who kindly assisted me 
in the verification of the specimens, and I would 
specially acknowledge my obligations to Mr Wm. 
Ingham, B.A., Editor of the “Census Catalogue 
of British Mosses,” for his valuable notes on many 
critical species and varieties. 
For the additional good records in the supple- 
