44 THE DISTRIBUTION OF HEPATIC IN SCOTLAND 
them to be considerably more so, but the scarcity of shelter 
will always prevent their being found in any great quantity. 
The most striking difference in the flora of the two groups 
of islands is the apparent absence of Plewrozia in Shetland, 
while it is abundant in Hoy, and has also been found else- 
where in Orkney. This is doubtless due to the want of 
suitable ground in Shetland, as the species is frequent in 
the Faroes and the northern mainland. 
The Faroes have been so well searched for hepatics that 
a comparison with the less examined Shetland is at present 
unsatisfactory. Remarks on the comparative floras of the 
Faroes and the whole of Scotland are made in another 
section. In the meantime it may be noted that the hills 
in the Faroes ascend to a greater height than they do in 
Shetland, and for this reason the high arctic-alpine species 
Pallauvicinia Blyttii, Gymnomitriwm coralliorides, and 
Lophozia Wenzelii, which are found in the former, will 
probably not occur in the latter, while all the Atlantic 
species of the Faroes should be found if shelter and 
suitable edaphic conditions are present. The following 
species and varieties have been found in Shetland but not 
in the Faroes:—Aneura palmata, Pallavicinia hibernica, 
Marsupella Sullivanti, Nardia convpressa, Haplozia 
crenulata var. gracillima, Lophozia bicrenata, Duplo- 
phyllum obtusifolium, Odontoschisma denudatum (type), 
Calypogeia urguta, Lepidozia pinnata, Seapania wmbrosa, 
S. compacta, Frullania dilatata. All the above, with the 
exception of Mars, Sullivanti and Nardia compressa, are 
almost confined to the low ground in Scotland, and are 
mostly of a somewhat Southern type of distribution. One 
plant, Madotheca rivularis var. furoensis, which Jensen 
discovered in the Faroes, has only been found in that group 
and in Shetland. 
ARRANGEMENT AND SEQUENCE OF SUB- 
PROVINCES AND VICE-COUNTIES 
I wAve finally decided to use Watson’s Sub-Provinces 
and Vice-Counties, with a few alterations, as the least 
objectionable arrangement for showing the distribution of 
