268 CYCLOCARPINES [LECANORA 
turns a delicate blue, in more concentrated solution, the asci generally 
become vinous or tawny-red, and a violet tinge is frequently produced 
in transition, or remains when the other tints have faded away, 
depending evidently on the presence of small quantities of the vinous- 
colouring substance. 
In the absence of any true microscopic distinctions, the macro- 
scopic characters have been accepted as of varietal importance. 
Pharcidia epicymatia Wint. is frequently parasitic on the thallus of 
this and of allied species. 
Hab. On trunks of trees, rarely on old palings in maritime and 
lowland districts.—Rare in E., 8. and W. England, though probably 
overlooked.—B. M. Lyndhurst, New Forest, Hants; Churchhill, near 
Worcester ; near Cambridge; N. England. 
Form muscicola Wheld. & Wils. Lich. Perth. p. 37 (1915).— 
Thallus thin, grey (K + deep yellow, CaCl—). Apothecia 
moderate in size, concave or plane, shining, deep reddish or 
blackish-brown, the thalline margin entire ; spores 12-14 p long, 
7-8 p thick. 
“This form is probably a state due to the peculiar habitat, which 
is similar to that of L. epibryon. It differs from that, which is a 
more alpine plant, in having a more dusky thallus, apothecia about 
half the diameter, and shorter spores.” 
Hab. Creeping over mosses (Tortula and Grimmia) on walls, near 
Pitlochry, Perthshire. 
Var. chlarona Ach. Syn. Lich. p. 158 (1814); Hue in Bull. 
Soc. Bot. Fr. 1. p. 72 (1903).—Thallus thin, smoothish or some- 
what wrinkled-unequal, or thinly granulate, whitish or greyish. 
Apothecia rather small, plane or slightly convex, the disc generally 
flesh-coloured or pale-brown, the thalline margin thicker and 
more prominent than in the species, entire at first but soon 
becoming crenulate and the receptacle more or less furrowed ; 
spores rather smaller than the species 9-15 pw (rarely 17 yp) long, 
5-9 p thick.—L. subfusca var. distans and var. glabrata Mudd 
Man. pp. 146, 147 (1861) (non Ach.) ; f. chlarona Stizenb. in 
Bot. Zeit. xxvi. p. 898 (1868) ; Leight. Lich. Fl. p. 203 ; ed. 3, 
p. 188. LL. distincta var. chlarona Ach. Lich. Univ. p. 397 (1810). 
L. albella £. chlarona Cromb. Lich. Brit. p. 51 (1870). L. rugosa 
subsp. chlarona Nyl. in Flora Ixvi. p. 107 (1883); Cromb. Monogr. i. 
p. 413. L. chlarona Cromb. in Grevillea xviii. p. 68 (1890). 
Lichen distans Pers. ex Ach. 1. c. 
Ezasice. Larb. Lich. Hb. n. 257; Leight. n. 115; Mudd n. 
112, 113 (pro parte). 
In this variety the apothecia are rather small and scattered ; it 
differs from the species in the planer lighter-coloured dise and the 
more prominent margin, entire at first but soon crenulate. The 
furrows of the receptacle are not easily seen and they also occur 
occasionally in other varieties. Wheldon and Wilson (Journ. Linn. 
Soc. xliii. p. 114 (1915)) have referred a specimen from Chatburn, 
