HERBERTA 253 
suitable localities on the islands are comparatively few. 
It appears to be uncommon in the North Highlands, though 
doubtless locally frequent in parts near the west coast; but 
it has not been found in the eastern half of the extreme 
north of the mainland, and is rare in Orkney and is at 
least uncommon in Shetland. This species descends to sea- 
level in the West Highlands and is sometimes frequent on 
the low ground. In the East Highlands it is only found 
on the hills, where it ascends to about 3400 ft. alt., though 
rare above 2900 ft. When on the low ground it grows on 
damp peaty banks in shady ground, generally among rocks. 
On the hills it grows on rock ledges and rocky banks, 
preferably moist; but not rarely it is found on rather dry 
and exposed bare ground. In this last position it is dwarfed 
and very dark in colour, sometimes nearly black, and with 
the leaves hardly or not at all faleate. In its usual some- 
what sheltered localities it forms erect, reddish tufts, or 
scattered among other species, especially Bazzania tri- 
crenata. Sterile female plants are not uncommon. Male 
plants have not been seen. 
In Alpibus Scoticis (Dicks. ef. Pl. Crypt., Fase. iii. p. 12, 
1790); Ben Lomond (Hook. cf. Fl. Seot., p. 111). 
S.E. HicHianps.— #. Stirling: Glengyle (K. & S.). 
Mid Perth: Ben Lawers (Hook. cf. Brit. Jung., p. 4); Creag 
Chailleach, 1841 (Gard.); Glen Lyon, 1849 (Stark); Killin 
Hills, r.c. to 2900 ft. alt. (Macv.); Ben More, nr. summit 
(Dixon); Ben Heasgarnich (Meld.); Ben Laoigh (Dixon); 
do., v.c. (Macv.); Coire Ardran, vu. (Macv.); Stuichd-an- 
Lochain (Gard.). 
Mip E. HicHuanps.—Fforfar: Camlochan, 1843 (Gard.) ; 
do., 1873 (Ferg.); Clova (Ferg.). 
N.E. Hicuianps.—F. Inverness: Cairn Gorm (Hook. ef. 
Brit. Jung., p. 4); Coire Ghlas, Glengarry (How.). 
W. HicuHuanps.— Kintyre: Tarbert (Ewing). Clyde 
Isles: Arran, without other locality, 1845 (Stark). Dum- 
barton: Ben Vorlich, 1871 (Barker); do. c. (Maev.); 
Arrochar, R. (Macv.). Argyll: Ben Arthur (Hook. ¢f. 
Brit. Jung., p. 4); Glen Fyne, 1839 (W. W. Evans); Glencoe, 
alt. 1000 ft. (Macv.); Coire Athoich (A. Murr.); ravine on 
the low ground nr. Loch Awe Station (Macv.); Ben 
