BRITISH LICHENS

LECIDEA LECIDEACEiE 55
internally whitish, and the hypothecium almost colourless.­
Cromb. Lich. Brit. 77; Leight. Lich. Fl. 270; ed. 3, 269.
Hab. On the trunks of trees, rarely on soil.-Distr. Rare in the
southern counties of England and in E. and N. Scotland, not recorded
from the Channel Islands or from Ireland.-B. lIf. Ilsham Valley,
Torquay, Devon; New Forest, Hants; 'Vindsor Great Park, Berks;
Portlethen, Forfarshire; Glen Girnac, Braemar, Aberdeenshire; Applecross
House, Ross-shire.
Var. elreochroma Ach. Meth. 36 (1803) pro parte; Nyl. Lich.
Scand. 217.-Thallus determinate or subeffuse, thin, yellowish,
yellowish-grey or olivaceous. Apothecia black, livid-black, or
partly dark-reddish or dark-bluish-green; hypothecium pale or
yellowish-brown.-Mudd Man. 200; Cromb. Lich. Brit_ 77;
Leight. Lich. Fl. 270; ed. 3, 269. L. elwochroma Tayl. in Mackay,
Fl. Hib. ii. 119 (1836). L. enteroleuca Ach. Lich. Univ. 177 (1810).
L. parasema var. enteroleuca Nyl. Lich. Scand. 217 (1861) pro
parte (corticolous), Mudd Man. 201; Cromb. Lich. Brit. 77.
Lichen parasemus Sm. Engl. Bot. t. 1450 (1805) pro parte.
Lichenoides leprosum, &c., Dill. Hist. Muse. l. c. pro parte.
Exsicc. Cromb. n. 181; Leight. nos. 126, 327, 328, 332 (as
L. scabrosa); Mudd nos. 169, 170; Baxt. Stirp. Crypt. Ox. n.
19; Bohl. n. 45; J ohus. n. 345.
Distinguished from the type by the dIfferently coloured thin thallus,
which at first sight would almost seem to render It specifically distinct.
The apothecia are usually smaller I