LECANORA | LECANORACE 283 
equally to f. subangulosa Johns. Exs. n. 413 (1810); the change to 
wine-red is, however, much quicker in some specimens than in others. 
The specimens recorded under L. angulosa var. chondrotypa Cromb. 
Monogr. i. p. 420 (1894) belong to L. pallida and not to L. chondrotypa 
Ach. (Lich. Univ. p. 865 (1810) ).. Lichen glabratus Dicks., a herbarium 
name, is quoted by Nylander (Lich. Scand. p. 162) as synonymous 
with L. chondrotypa. The spermogones are black above with 
spermatia 14-18 p long. 
Hab. On trunks of trees, rarely on old palings, in maritime and 
inland districts.—Distr. Not uncommon throughout the British Isles. 
—B.M. Ullacombe, Bovey Tracey, Devon; New Forest, Hants; 
Shermanbury, near Lewes and near Hastings, Sussex; Holmwood, 
Surrey; Tunbridge Wells, Kent; Epping Forest, Essex; near Ciren- 
cester, Gloucestershire ; Nesscliff, Shropshire; Kempsey, Worcester- 
shire; Bottisham, Cambridgeshire; between Staithes and Loftus, 
Ayton, and near Easby, Cleveland, Yorkshire; Catterleen, Cumber- 
land; Appin, Argyll; Finlarig, Killin, Perthshire; Castleconnell, 
Limerick; near Belfast, Antrim. 
29. L. sordida Th. Fr. Lich. Arct. p. 115 (1860) (excl. vars.). 
—Thallus subdeterminate, thickish, continuous, then wrinkled or 
cracked-areolate, rarely subfarinose, sometimes radiate at the 
circumference, with a white hypothallus not often visible, whitish 
or cinereous (K + yellow). Apothecia scattered or crowded, 
small or large, innate or appressed, the disc plane, often becoming 
convex, dull-reddish or -brownish, generally bluish-black-pruinose 
(CaCl + yellow), the thalline margin thin, acute or often deeply 
crenate and flexuose, or disappearing; paraphyses crowded, 
slender, colourless, septate, especially towards the apex, the 
epithecium granular, dull-olive-brown ; spores ellipsoid, 10-14 p 
long, 6-7 p» thick.—L. glaucoma Ach. Lich. Univ. p. 362 (1810) ; 
Hook. Fl. Scot. ii. p. 48 & in Sm. Engl. Fl. v. p. 189; Tayl. in 
Mackay Fl. Hib. ii. p. 185; Mudd Man. p. 153; Cromb. Lich. 
Brit. p. 50 & Monogr. i. p. 420 (incl. subsp. subradiosa Nyl. in 
Flora lv. p. 549 (1872)); Leight. Lich. Fl. p. 215 (incl. 
f. cerulata? and f. cinereopruinosa); ed. 3, p. 204 (incl. ff.). Lichen 
rupicola L. Mant. p. 132 (1767)? Lightf. Fl. Scot. i. p. 806% 
Huds. Fl. Angl. ed. 2, p. 525? With. Arr. ed. 3, iv. p. 13, t. 31, 
fig. 2 (1796). LL. sordidus Pers. in Ust. Ann. Bot. vii. p. 26 
(1794). L. glaucoma Ach. Lich. Suec. Prodr. p. 56 (1798): 
Engl. Bot. t. 2156. Verrucaria glaucoma Hoffm. Fl. Deutschl. 
ii. p. 172 (1795). Rinodina glaucoma 8. F. Gray Nat. Arr. 1. 
p. 453 (1821). 
Exsicc. Johns. n. 112; Larb. Lich. Hb. n. 259; Leight. n. 53 ;- 
Mudd n. 122. 
An extremely variable plant, both as regards thallus and apothecia, 
but the pruinose character of the disc, combined with the reaction to 
CaCl, is a sure test. The apothecial margin is generally entire but 
may be deeply indented, with the dise flat or turgid. Spermogones 
are frequent, and like black points in the thallus. Thallus and apothecia 
are the hosts of various parasites, the latter of Arthonia varians. 
