PLAGIOCHILA LAF 
common than on the mainland. It is rather common in 
West Ross, probably also near the coast of West Sutherland, 
but it has not been found in the extreme north of the 
mainland, nor in Orkney or Shetland. Occurs on limestone 
as well as on schistose and gneissic rocks, but is uncommon 
on the first-named formation. It is sometimes in mixture 
with P. spinulosa, less frequently with P. tridenticulata. 
Grows in pale-green compact patches on boulders and _half- 
buried rocks, and frequently on tree stems, especially birch, 
in very shaded and moist situations. In its eastern limit 
it seems to be confined to birch-trees. Perianths are rare; 
male plants very rare. Fruit unknown. 
S.W. Lowranps. — Kirkcudbright: Glenlaggan Hill 
(M‘And.); Holm Glen (M‘And.); Bennyguinea (M‘And ); 
north of Blackcraig, New Galloway (M‘And.). 
N.W. Lowianps.— Ayr: Afton Water, on wall (Macv.); 
Ladyland (Scott). | 
S.E. HicgHnuanps.—S. Perth: Trossachs, on birch-trees 
(Ewing and West). Mid Perth: Achrioch Wood, Tyndrum, 
on birch-trees, F. (Macv.); Finlarig Wood, Killin, on birch- 
tree (Ewing). 
W. HiIGHLanps.—Kintyre: Southend (Ewing); Caolis- 
port, per. (Ewing). Clyde Isles: Loch Ranza, v. (Macv.); 
Lamlash (M‘And.). Dumbarton: Ardlui, R.c. (Macv.); 
Arrochar, F. (Macv.). Argyll: Coire Athoich, Ben More 
(A. Murr.); Coire Gabhail, Glencoe, alt. 1000 ft. (Maev.) ; 
Ballachulish (Macv.); Kentallen (Macv.); Ben Cruachan, 
R.C. in Coire Ghlais, on boulders (Macy.); Glen Ure (Kenn.) ; 
head of Loch Awe, F. (Macv.). W. Inverness: Moidart, c. 
(Macv.); Ardnamurchan, c. (Macv.); Sunart, c. (Maev.); 
Glenfinnan (Macv.); Coire Dheirg, Glen Nevis (Macv.); 
Morar, per. (West). 
INNER HeEpripes.—S. Inner Hebrides: Jura (Ewing) ; 
Sgor Bhogachain, Islay, alt. 1000 ft. (Gilm.); Ardimersay, 
Islay (Gilm.). Mid Inner Hebrides: Nr. Tobermory (Kenn.); 
do., F. (Macv.); Allt na Searmoin (Kenn.). WN. Inner 
Hebrides: Nr. Loch Coruisk, 1881 (Barker); Corrie and 
Mill Burn, Broadford, r. (Macv.). 
OuTER HeEpripEs.—Tarbert, in many places (West). 
Lower N. HicHianps.—W. Ross: On rocks near Loch 
TRANS. BOT. SOC. EDIN. VOL. XXV. 12 
