MARSUPELLA 109 
Islands it is common, descending to sea-level on the west 
coast from the Clyde northwards. 
This species is common on schistose rocks, granite, and 
various volcanic rocks. Forms large, usually erect, dark- 
green masses on submerged rocks in streams, or where 
there is a constant trickle of water. It is also sometimes 
found submerged at the margin of Highland lochs. 
Perianths and male plants are common; fruit is frequent. 
S.W. LowLaNnbs. — Kirkcudbright: Knockindoch Hill 
(Scott); Merrick (J. Murr.); Tannoch (M‘And.); Glen 
Trool (Macv.). Wigtown: Knowe (Ewing). 
N.W. Low.anps.— Renfrew: Glen, Misty Law (Scott). 
E. Lowianps.—Peebles: Talla W., F. above alt. 950 ft. 
(Macv.). Edinburgh: Nether Habbie’s Howe (Evans) ; 
Gutterford Burn (Evans). 
S.E. HicHianps.—S. Perth: Ben Aan (West); Trossachs 
(Ewing); Tillicoultry Glen (Evans). Mid Perth: Ben 
Laoigh (Ewing); do., c. (Macv.); Ben Dubh Craige, v.c. 
(Macy.); Ben Odhar, c. (Macv.); Am Binnean (Ewing); 
Killin (J. Hunter); King’s Seat, Killin (Evans). WV. Perth: 
Glas Thulachan (Ewing). 
Mip E. Hicuianps.—Forfar: Foot of Glenesk (Croall) ; 
Camlochan (Ferg.); Clova (Aimer). Kincardine: Strachan 
Sim); Dalfro (Sim). SS. Aberdeen: Lochnagar (Sim); 
Corrie Ceandor (West); Peter’s Hill (Sim). 
N.E. HicHuanps.—H. Inverness: Mam Soul (Cocks); 
Invercannich (Cocks); Kincraig (Miss Macv.); Glen 
Tromie (Miss Macy.); Braeriach (A. Wilson and J. A. 
Wheldon). 
W. HicHianps.—Clyde Isles: Shant Hill (Campb.); 
Arran (Ewing); Loch Ranza, c. (Macv.); Benlister Glen 
(M‘And.). Dumbarton: Tarbert (Macv.). Argyll: Ben 
Cruachan (Croall); Ben Udlaidh (Macy.); Ballachulish 
(Macv.); Ben Fhada, Glencoe (West); Ben Doureann, c. 
(Macv.); Ben an Dothaidh, c. (Macv.); Glen Lochy (Macy.) ; 
Kentallen (Macv.); Ben Arthur, v.c., 400 to 2600 ft. 
(Macv.). ~Puck’s Glen (A. Murr.). W. Inverness: Ben 
Nevis, 1875 (Whitehead); Glen Nevis (Macv.); Choir 
Arder, alt. 3500 ft. (Ferg.); Moidart, c. (Macv.); Ardna- 
murchan, Cc. (Macy.); Sunart, c. (Macyv.). 
