LECANORA| LECANORACEE 293 
E. Symmicta group.—Thallus pale yellowish-grey, scanty 
(reactions various, or none). Apothecia generally small, mostly 
becoming turgid with the margin disappearing, pale, then becoming 
dark, 
Apothecial margin disappearing. 
39. L. symmicta Ach. Syn. Lich. p. 340 (1814).—Thallus 
effuse, thin, finely granulate or subleprose, pale yellowish-green 
or whitish straw-coloured (K + yellow, CaCl + orange). Apothe- 
cia small, rather scattered or crowded, the disc soon convex, pale 
flesh-coloured, becoming darker or sometimes olivaceous, the 
thalline margin thin, soon disappearing; paraphyses stoutish, 
subdiscrete, septate, more or less widened and sometimes darker 
at the tips, the epithecium of brown granules ; spores ellipsoid 
or oblong, 8-14 p» long, 4-5 p» thick.—Leight. Lich. Fl. ed. 3, 
p. 183 (excl. var. aitema); Cromb. Monogr. i. p. 433. L. varia 
var. symmicta Ach. Lich. Univ. p. 379 (1810); Mudd Man. 
p. 150; Cromb. Lich. Brit. p. 52 pro parte; Leight. Lich. Fl. 
p- 193 pro parte. 
Ezxsicc. Johns. n. 136, pro parte. 
This species and the following, L. symmictera, are closely allied in 
habit and structure, the chief difference is in the orange reaction of 
the thallus with CaCl. Both species tend to occur in pale thin 
patches, with the apothecia more or less crowded and appressed, 
frequently turgid and irregular in outline; possibly they might be 
regarded as growth conditions of one species. 
Hab. On old palings and on fir trunks in maritime and inland 
districts.— Distr. Rare in S. and W. England, N. Wales, W. Scotland 
and §. Ireland.—B. M. Lyndhurst, New Forest, Hants; Anglesea ; 
Asby, Cumberland ; Appin, Argyll ; Great Island, Cork. 
Var. sepincola Nyl. in Flora lv. p. 249 (1872).—Thallus 
similar to that of the species. Apothecia becoming almost 
blackish; spores larger, 10-17 w long, 4-5 » thick.—Leight. 
Lich. Fl. ed. 3, p. 183 ; Cromb. Monogr. i. p. 434. LL. varia var. 
sepincola Nyl. Lich. Scand. p. 164 (1861); Cromb. Lich. Brit. 
p- 52; Leight. Lich. Fl. p. 193. Lecidea sxpincola Ach. Syn. 
Lich. p. 35 (1814). 
Eesicc. Johns. n. 137. 
Distinguished by the darker apothecia and the longer spores, and 
thus resembling those of L. symmictera var. aitema. There is an 
appearance of faint septation in some of the spores, and some are 
biguttulate. 
Hab. On old palings in upland districts.—Distr. Rare in N. 
England and among the Grampians, Scotland.— B. M. Hart, Durham ; 
Lamplugh, Cumberland; Killin, Perthshire; Crathie, Braemar, 
Aberdeenshire. 
40. L. symmictera Nyl. in Flora lv. p. 249 (1872).—Thallus 
effuse, finely granulate, sometimes subleprose or almost obsolete, 
