MARSUPELLA 105 
MARSUPELLA EMARGINATA (Hhrh.) Dwm. 
Generally distributed above the agricultural region from 
Dumfries to Shetland. It is rare in the low-lying districts 
of the Lowlands and East Highlands. In the former the 
typical plant hardly occurs below the subalpine region and 
is rare in many of its subalpine districts. This is the case 
over a large part of the Southern Uplands, where the rock 
is comparatively seldom exposed on the surface. On the 
granite hills of Kirkeudbright, and locally in a few other 
parts of the Uplands where the rock is exposed, the typical 
plant is common, but generally speaking the plant is con- 
tined to soil and is found as a small form with the leaf- 
lobes rather acute. Over most of the subalpine region of 
the Lowlands it is absent, but is found in various detached 
rocky places with other subalpine species down, though 
rarely, to sea-level. In the mountainous districts over all 
the Highlands the plant is abundant from sea-level, and 
ascends to 3500 ft. alt. in the centre of Scotland and to 
3600 ft. alt. on Ben Nevis. Although the typical plant 
usually occurs only on rocks, it is also found on soil in the 
West Highlands, but the usual form on soil over the 
Highlands is the small, rather acute-lobed plant. 
This species occurs on all our formations, but is uncommon 
on limestone and on sandstone. Grows in dark-green to 
reddish patches, which are often of considerable extent, on 
moist or wet rocks, but rarely on rocks which are constantly 
wet. The red colour is mostly assumed when on granite and 
gneiss; when on soil the plant is frequently nearly black. 
Fruit is common, and is mature from February to July. 
S.W. LowLanps.—Dumfries: Hartfell, 1880 (A. M‘K. in 
Herb. Croall); Crichope Linn (Macv.); Sanquhar district, 
vu. (Macy.). Kirkcudbright: Criffel, 1840 (Cruicks.); New 
Galloway (M‘And.); Merrick (J. Murr.) ; Glen Trool (Maev.); 
Penkill Burn (Macv.). Wigtown: Knowe (Ewing); nr. 
New Luce (Ewing). 
N.W. Low.anps.— Ayr: Largs (Ewing); W. of Loch 
Doon (West); above Ladyland (Scott). Renfrew: Loch- 
winnoch (Ewing); Loch Thom (Ewing); Cloch (Ewing); Misty 
Law (Scott). Lanark: Elvanfoot district, v.R. (Macv.). 
