gyalecta] lecideace^ 7 



Hah. Incrusting decayed mosses on the ground in subalpine and 

 alpine regions. — Distr. Sparingly in Yorkshire and on the Grampians, 

 Scotland. — B. M. Craig Calliach, Ben Lawers and Killin, Perthshire ; 

 Morrone, Braemar, Aberdeenshire. 



4. G. geoica Ach. Lich. Univ. p. 31 (1810).— Thallus effuse, 

 thin, subpulverulent, greyish (K — , CaCl — ). Apothecia minute, 

 urceolate, more or less immersed, pale yellowish-flesh-coloured, 

 the margin entire, persistent, whitish ; hypothecium pale ; para- 

 physes somewhat coherent, clavate at the apices ; spores 8nate, 

 oblong or ellipsoid, 3-septate, usu?illy 0,012-15 mm. long, 0,006-7 

 mm. thick ; hymenial gelatme bluish then sordid-violet with 

 iodine. — G. WaJilenhergiana Ach. Syn. p. 9 (1814); Leight. 

 Angio. Lich. t. 13. f. 2. G.foveolaris Mudd Man. p. 167 (1861) 

 (non Schaer.). Lichen geoicus Wahlenb. in Vet. Ak. Handl. p. 142, 

 t. 4. f. 5 (1806), Lecidea geoica Nyl. in Mem. Soc. Cherb. v. 

 p. 119 (1857) ; Cromb. Lich. Brit. p. 62 ; Leight. Lich. Fl. p. 333 ; 

 ed. 3, p. 359. 



Exsicc. Leight. n. 123. 



Closely related to the preceding, with which at times it has been 

 confounded, but differs in the much smaller fructification and the 

 shorter spores. The disc of the numerous at times aggregate 

 apothecia often collapses in age, so that, as in other plants of this 

 section, they appear whitish from the colour of the hypothecium. 



Hab. On calcareous soil among rocks and on wall-tops in upland 

 rarely maritime situations. — Distr. Very local in England and the 

 Highlands of Scotland. — B. M. Cromer, Norfolk ; Stiperstones and 

 Whitecliffe Rocks, near Ludlow, Shropshire ; Barcaldine, Argyll ; 

 Craig Calliach and Ben Lawers, Perthshire ; Morrone, Braemar, 

 Aberdeenshire. 



5. G. trunci^ena Hepp Flecht. Eur. n. 27 (1853).— Thallus 

 effuse, very thin, subleprose, greyish, often evanescent (K — , 

 CaCl — ). Apothecia small, urceolate, pale reddish flesh-coloured, 

 the margin thick, entire, whitish ; hypothecium colourless ; 

 spores 8nate, oblongo-fusiform or oblong, 5-7-septate, usually 

 with one or two longitudinal septules, 0,016-23 mm. long, 

 0,007-9 mm. thick ; hymenial gelatiiie pale-bluish with iodine. — 

 Mudd Man. p. 167, pro parte. G. Wahlenhergiana var. trun- 

 cigena Ach. Lich. Univ. p. 152 (1810). Lecidea truncigena Nyl. 

 in Mem. Soc. Cherb. v. p. 119 (1857) ; Cromb. Lich. Brit. p. 62 ; 

 Leight. Lich. Fl. p. 352 ; ed. 3, p. 381. 



Exsicc. Leight. n. 147; Larb. Lich. Hb. n. 188. 



This plant was with the following confused by earlier authors 

 under the name Lichen marmorcus with L. cupularis, to states of 

 which it is externally subsimilar. It differs, however, in the smaller 

 apothecia, the mode of division of the rather longer spores, and in 

 the nature of the substratum. In the British specimens the thallus 

 is often little visible, and the apothecia are somewhat scattered. 



Hah. On the trunks of trees, chiefly elms and a,sh, in wooded 

 maritime and upland tracts. — Distr. Sparingly in England and S. 



