ECANORA. | LECANO-LECIDEEL. 353 
A well-marked species which is rather variable in different regions. 
Though recorded by Leighton, /. c, fid2 Dr. Stirton, it is a very doubtful 
British plant, and is not at all likely to have occurred in the locality spe- 
cified, since it is certainly absent on the higher mts. of the vicinity. 
Hab, On granitic and schistose rocks in alpine places.—Distr. Re- 
ported as gathered on Ben Brecht, Argyleshire. 
5. L. cartilaginea, Ach. Lich. Univ. (1810) p. 415.—Thallus 
expanded, cartilaginous, imbricato-laciniate, somewhat shining, pale 
ochroleucous or greenish-straw-coloured ; laciniw narrow, linear or 
sublinear, whitish beneath, slightly dilated, dichotomously divided 
or inciso-lobed or crenate at the apices (K —). Apothecia large, 
somewhat plane, fleshy- or tawny-testaceous, the thalline margin 
entire or crenulate; spores oblong or oblongo-ellipsoid, 0,011-16 
mm. long, 0,005-6 mm. thick.—Cromb. Grevillea, xviii. p. 44.— 
Squamaria cartilaginea Borr. Eng. Bot. Suppl. t. 2802 ; Mudd, Man. 
p. 128; Cromb. Enum, p. 44; Leight. Lich. Fl. p. 172, ed. 3, p. 158. 
Lichen cartilagineus Ach. Vet. Ak. Handl. (1795) p. 133, t. v. f. 4. 
Intermediate between the preceding and the following species, to the 
one or other of which it approaches in different regions, but diff:rs from 
both in the characters of the laciniz. In our British specimens the thallus 
is pulvinate, as it usually is elsewhere. The apothecia are numerous, be- 
coming at length irregularly lobed and angulose. 
Hab. On a single rock in a maritime locality Distr. With certainty 
only in N. Wales, though reported also from Yorkshire (fide Leighton).— 
: M.: Near the outlet of Llyn Bodlyn, above Barmouth, Merioneth- 
shire. 
6. L. saxicola Ach. Lich. Univ. (1810) p. 431.—Thallus orbi- 
cular; moderate or somewhat large, appressed, areolato-crustaceous 
in the centre, radiate at the circumference, greenish- or pale-ochro- 
leucous ; radii contiguous, plane or subplicate, crenate at the apices. 
Apothecia small or moderate, plane or somewhat convex, pale- or 
brownish-testaceous, the thalline margin thin, entire or crenulate; 
spores ellipsoid, 0,010--16 mm. long, 0,006-7 mm. thick.—Cromb. 
Grevillea, xii. p. 61; Tayl. in Mack. Fl. Hib. ii. p. 140.—Squa- 
maria saxicola Sm. Eng. Bot. v. p. 197 ; Mudd, Man. p. 129; Cromb. 
Lich. Brit. p. 44; Leight. Lich. Fl. p. 173, ed. 3, p. 158. Placodium 
saxtcolum Gray, Nat. Arr. i. p. 447. Lvchen sawicola Poll. Pl. Pal. 
(1777) p. 225; Eng. Bot. t. 1695. Lichen muralis Dicks. Crypt. 
fasc. i. p. 11; With. Arr. iv. p. 29.—Brit. Hws.: Leight. n. 145; 
Mudd, n. 92; Larb. Lich. Hb. n. 213; Bohl. n. 55. 
A rather variable plant which may be recognized from its British allies 
by the thallus being thinner, radiate, appressed, and areolate in the centre. 
Sometimes it is less appressed when it is rather thicker ‘approaching L. 
cartilaginea), and occasionally it is effuse and somewhat scattered. The 
apothecia are numerous and crowded, becoming flexuose and difform 
from mutual pressure, with the margin at times flexuosc-crisp. Other 
and more marked differences in the thallus and apothecia give rise to the 
varieties and subspecies that follow. 
‘ 2a 
