356 LICHENACEI. [LECANORA. 
Allied to subgenus Sguamaria, under which the species have usually 
been included, but distinguished by the cephalodia, which are constant in 
all the species (most of which are exotic) under all conditions of growth. 
8. L. gelida Ach. Lich. Univ. 
(1810) p. 428.—Thallus orbicular, 
closely adnate, rimoso-areolate in 
the centre, laciniato-radiose at the 
circumference, sordid-white or pale- 
greyish (K-+yellow, CaCl + red); 
cephalodia scattered, greyish- or 
brownish-flesh-coloured. Apothe- 
cia moderate, adnate, concave or 
plane, pale-testaceous, the thalline 
margin thick, entire ; spores ellip- 
soid, 0,014-18 mm. long, 0,006-8 
mm. thick.—Cromb. Journ. Linn. 
Soc. Bot. xv. p. 2382; Hook. Fl. 
Scot. ii. p. 50; Tayl. in Mack. Fl. 
Hib. ii. p. 140.—Squamaria gelida : 
Sm. Eng. Fl. v. p. 195; Mudd, Fig. 60. 
Man. p. 129; Cromb. Lich. Brit. gee We eee 
p. 45; Leight. Lich. Fl. p. 174, ed. 3, é eons 
p18: Fiacadlun geligum Gray, Sse es cite wee 
Nat. Arr. i.p.448. Lichen gelidus matia, x 500. 
Linn. Mant. ii, (1771) p. 133; 
Dicks. Crypt. fase. ii. p. 19; With. Arr. iv. p.26; Eng. Bot. t. 699.— 
Brit. Exs.: Dicks. Hort. Sic. n. 25; Larb. Lich. Hb. n. 50, 
Easily recognized amongst British Lecanoret by the cephalodiiferous 
thallus, which is usually of moderate size, greyish-flesh-coloured when 
moist, and occasionally sprinkled with greyish or greyish-olive, impressed 
soredia. The cephalodia, which are more or less numerous according to 
the development of the thallus, are depresso-verrucarioid, at length radi- 
ato-rimose, internally with the gonimia icra te or often several moni- 
liform. ‘The apothecia, when present (for the thallus is often sterile), are 
usually sparingly scattered. A young sterile state, with the thallus little 
developed and scattered and bearing a few young cephalodia, is form dis- 
persa (non Fr.), Cromb, Grevillea, i. p. 171; Leight. Lich. F1. iii. p, 160. 
Hab. On rocks, granitic, schistose, and old red sandstone, in upland and 
subalpine districts.—Distr. Rather local in England and Wales, more 
frequent in Scotland, and probably also in Ireland.—B, M.: St. Austell, 
Cornwall; Cader Idris, Dolgelly, and Llyn Bodlyn, Merionethshire ; 
Eglestone and Teesdale, Durham ; near Kendal, Westmoreland; Knock 
Morton Screes, Cumberland. New Galloway, Kirkcudbrightshire ; Loch 
Awe, Argyleshire; Craig Calliach, Ben Lawers, and Craig Tulloch, 
Perthshire ; Clova and Canlochan, Forfarshire; Glen Caudlic and Glen 
Cluny, Braemar, Aberdeenshire ; Rothiemurchus, Ben Nevis, and Fort 
Augustus, Inverness-shire ; Hills of Applecross, Ross-shire. Dunkerron, 
and Connor Cliffs, Dingle, co, Kerry; Letterfrack and Recess, Conne- 
mara, co. Galway; Carnlough, co. Antrim. 
