ECAXORA.] T/EC.YXO-LEC1DEEI. 353 



A well-marked species wliich is rather variable in different regions. 

 Thoug-li recorded by Laighton, /. c. fidi 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. 



Hob. 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, imbrrcato-laciiiiate, somewhat shining, pale 

 ochroleucous or greenish-straw-coloured ; lacmiae 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. 

 Sguamaria cartilayinea Borr. Eng. Bot. Suppl. t. 2802 ; Mudd, Man. 

 p. 128 ; Cromb. Enum. p. 44 ; Leight. Lich. Fl. p. 172, ed. 3, p. 158. 

 Lichen cartilayineus Ach. Yet. Ak. Haudl. (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 differs from 

 both in the characters of the laciniae. 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.. 



Hal). On a single rock in a maritime locality. Diatr. "\Vith certainty 

 only in N. Wales, though reported also from Yorkshire (fide Leightou). 

 B. 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 

 saxicolum Gray, Nat. Arr. i. p. 447. Lichen saxicola Poll. PI. Pal. 

 (1777) p. 225 ; Eng. Bot. t. 1695. Lichen muralis Dicks. Crypt, 

 fasc. i. p. 11 ; With. Arr. iv. p. 29. Brit. Exs.: 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. 

 cartilaginca), and occasionally it is effuse and somewhat scattered. Tho 

 apothecia are numerous and" crowded, becoming flexuose and difform 

 from mutual pressure, with the margin at times flexuoso-crisp. Other 

 and more marked differences in the thallus and apothecia give rise to tho 

 varieties and subspecies that follow. 



2A 



