lecidea] lecidbace^ 77 



130. L. mesotropa Nyl. in Flora 1. p. 328 (1867).— Thallus 

 indeterminate, verrucose-areolate, greyish ; the areoJce rather 

 •convex (K — , K(CaCl)+ reddish). Apothecia small, adnate, 

 somewhat plane, opaque, margined, blackish or brownish-black, 

 the margin obtuse, at length evanescent ; paraphyses slender, 

 not well discrete ; epithecium brownish ; hypothecium colourless ; 

 spores ellipsoid, colourless, 0,009-13 mm. long, 0,005-6 mm. 

 thick ; hy menial gelatine bluish with iodine. — Cromb. in Journ. 

 Bot. vii. p. 49 (1869) & Lich. Brit. p. 81 ; Leight. Lich. Fl. 

 p. 277 ; ed. 3, p. 280. 



Intermediate between L, lapicida and L. lithopMla, the thallus 

 much resembling the former and the apothecia those of the latter 

 species. The apothecia have often a biatorine aspect. 



Hab. On a gneissic boulder in an upland mountainous region. — 

 B. M. West slope of Ben Lomond, near Loch Ard, Perthshire (the 

 •only locality). 



131. L. mesotropoides Njl. in Flora Iv. p. 359 (1872).— 

 Thallus subdeterminate, moderate, verrucose-areolate-diffract 

 greyish, the areolae convex (K-f yellowish, CaCl — , medulla I — ). 

 Apothecia small, prominent, blackish, at first plane and thinly 

 margined, then convex and immarginate ; paraphyses slender, 

 more or less coherent ; hypothecium colourless ; spores ellipsoid, 

 0,009-11 mm. long, 0,006-7 mm. thick; hymenial gelatine 

 bluish with iodine. — Cromb. in Grevillea i. p. 69 ; Leight. Lich. 

 Fl. ed. 3, p. 282. 



Distinguished from L. mesotropa by the thalline reactions, the 

 thinner apothecia and the shorter spores. The two British specimens 

 are well fertile. The spermogones, here and there visible, have the 

 spermatia 0,007-0,010 mm. long, scarcely 0,001 mm. thick. 



Hah. On calcareous and schistose stones of a wall in an upland 

 situation. — B. M. Craig Tulloch, Blair Athole, Perthshire (the only 

 locality). 



132. L. mesotropiza Nyl. in Flora Ivi. p. 20 (1873).— Thallus 

 indeterminate, moderate, verrucose-rugulose, whitish (K-f deep 

 yellow, CaCl — ). Apothecia small or submoderate, more or less 

 crowded, adnate, black, at first plane and thinly margined, at 

 length convex, immarginate, sometimes slightly pruinose, bluish- 

 grey within ; paraphyses not very discrete ; epithecium dark- 

 greenish-blue ; hypothecium colourless; spores ellipsoid, 0,011- 

 12 mm. long, 0,007 mm. thick ; hymenial gelatine bluish, the 

 asci violet, with iodine. — Cromb. in Grevillea i. p. 142; Leight. 

 Lich. Fl. ed. 3, p. 275. 



Externally very similar to the preceding, from which it differs 

 •chiefly in the whitish verrucose thallus and the bluish epithecium. 



Hab. On schistose stones of a wall in an upland district. — B. M. 

 Hill of Ardo, near Aberdeen (the only locality). 



