LECANORA | LECANORACEX 285 
Var. Swartzii A. L. Sm.—Thallus thickish, deeply cracked- 
areolate, somewhat radiating at the circumference. Apothecia 
plane or convex, aggregate-conglomerate.—L. glaucoma var. 
Swartzii Nyl. Lich. Scand. p. 159 (1861); Cromb. Lich. Brit. 
p- 50 & Monogr. i. p. 421; Leight. Lich. FI. p. 216; ed. 3, p. 205. 
Lichen Swartzii Ach. in K. Vet. Acad. Handl. xv. p. 185, t. 1, 
fig. 2 (1794); Dicks. Pl. Crypt. fasc. iv. p. 23. 
Not easily defined in the absence of satisfactory specimens. In the 
single British specimen, the apothecia are deeply crenate, a character 
that occurs in the species, and are often turgid and difform and with 
deeply indented margins. They are much larger than those in the 
figure by Acharius, which Crombie, however, says is not good. 
Hab. On rocks in mountainous districts —B. M. Ben Cruachan, 
Argyll. 
Var. inflexa A. L. Sm.—Thallus deeply cracked-areolate. 
Apothecia generally crowded into cushion-like tubercles, rather 
large, the margin prominent, strongly crenate or flexuose, white. 
—L. glaucoma var. infleca Johns. ex Cromb. ll. c. 
Exsice. Johns. n. 114. 
A well-marked plant, more or less connected with the preceding 
variety, but the apothecia are more crowded into tuberculate masses, 
and the thallus is more cinereous. 
Hab. On quartzose rocks.—B. M. Alston, Cumberland (the only 
locality). 
30. L. cenisia Ach. Lich. Univ. p. 361 (1810).—Thallus of 
warted granules contiguous or scattered, subglobose or forming 
an areolate crust, whitish or greyish (K + yellow). Apothecia 
often rather large, up to 2 mm. across, yellowish- or dull-brown 
becoming darker, sometimes almost black, greyish-pruinose, the 
thalline margin prominent, entire, then becoming flexuose and 
crenulate ; paraphyses slender, crowded, often undulate, scarcely 
widened upwards, septate near the tips and colourless, the 
epithecium brown ; spores broadly ellipsoid, 12-19 » long, 8-10 p. 
thick ; hymenial gelatine blue with iodine.—L. atrynea vay. 
cenisia Lamy in Bull. Soc. Bot. Fr. xxv. p. 409 (1878) ; Cromb. 
in Grevillea xviil. p. 68 (1890) & Monogr. i. p. 415. 
Characterized by the warted granules of the thallus and by the 
pruinose apothecia. The spores of the specimens examined measured 
only rarely up to 17 p in length. The apothecium has been described 
as zeorine, i.e., with a double margin, a character not easily demon- 
strated in this lichen. 
Hab. On schistose rocks in a maritime district.—B. M. Near 
Portlethen, Kincardineshire (the only British record). 
Var. atrynea Harm. Lich. Fr. v. p. 992 (1913).—Thallus 
more compact than in the species, granular- or warted-areolate, 
whitish or greyish (K + yellowish). Apothecia generally rather 
small and scattered or often crowded, the dise brown and scarcely 
