49 THE LICHENS OF PERTHSHIRE 
rege rr = the preceding. a ahaa Cromb. Lichenes, 
5 ochan-a-Chait, Cro 
¥? pelo shileg Mudd. On ead rocks of mica-schist. 88. Head 
of Lochan-a-Chait, Ben Lawers, Jones ex Mudd, 164. Creag-na- 
Caillich, Cromb. 
A. gibbosa Koerb. On rocks and walls. 88. Summit of Ben 
Sacuetas Dickson, Fascic. 2, 20. 89. Near Cluny Bridge, Pit- 
lochry, 1912. sah 
Var. lusca Nyl. 88. Ben Lawers and Creag-na-Caillich, 
Cromb. 471. 
A, depressa Nyl. On rocks of mica-schist. 88. Ben Lawers, 
Cromb. Lichenes, 55. Achmore, Killin, 1913. 
A. subdepressa Nyl. On rages rocks. 88. Creag-na-Caillich 
— Ben Lawers, Cromb. 472. . Near Dunkeld, 1912. Our 
mples approach A. depressa in thote dark olive-grey colour, and 
parr —— spores (20 x 14), but the lecanornine apothecia, 
several in each areola, agree well with the description of this 
iubopediag. 
A. cesiocinerea A.L. Sm. On rocks. 88. Glen Lyon and 
Ben Lawers, Cromb. 472. 
Form obscurata Nyl. 88. Craig Tulloch, Cromb. 473. 
A. calearea Somm. On rocks and walls, preferring those that 
are calcareous. 88. Head of Lochan-a-Chait!, Jones ex Mudd, 307. 
Killin, Cromb. ex Leight. ed. 3, 192. 89. Blair Atholl, Cromb. 
Ven contorta Ny}. — Killin, Cromb. 89. Blair Atholl, 
Cromb. Killiecrankie 
Form — ecu 89. Glen Fender, Cromb. 479. 
aa ag? 
S Bopmaie Somm. 88. Craig Tulloch, Cromb. ex Leight. 
ed. M "209. 89. Glen Fender, Cron sis 
A. verrucosa Mudd. Creeping over dead mosses or rocks, or, 
rarely, on the ground. 88. Creag- na-Caillich and Ben Lawers, 
Maingay ex Mudd, 164. Craig Tulloch, Cromb. 
A. poriniformis L. Sm. On schistose rocks and walls. 
88. Ben Lawers, 1865, Carroll in J. Bot . 1866, 23. Craig 
Tulloch, Cromb. Ben Laoigh, at 2500 ft., 1911. 
. Dicksontt A. L. Sm. On rocks and walls. Fr Sere amongst 
the mountains in all three bivanrhag ind ascending to 3900 ft. on 
Ben Law It is difficult to believe with Crombie that the 
colour of the thallus of this oe is anes! e accidental suffusion 
with iron peroxide. It occasionally grows on pure white quartz 
crystals (as on Ben Lawers) mingled with white crusted species, 
and is very uniform in tint on granites, schists, and sandstones. 
_*A, flavida Arn, On damp quartzose rocks. 88. South-east 
side of Loch Harn. Spores, not well developed, 3-15 » x 7-10 p. 
A, lacustris Fr. fil, On rocks in or by streams where often 
submerged. 87. Glen Falloch, Cromb. 88. Lochan-a-Chait, Holl 
ex Leight. ed. 1,210. Ben Lawers, Cromb. Glen Lochay, 1913. 
. Prevostii Fr. fil. On limestone rocks. 88. Craig och, 
—— yes occur form melanocarpa Stiz. and var. afinis Nyl. 
rom 
aoa Se 
