82 LECANO-LECIDEEI [lECIDEA 



30 mm. loWfi;, 0,011-16 mm. thick or smaller. — L. trochodcs 

 Cromb. Lich. Brit. p. 94 (1870) ; Leight. Lich. Fl. p. 257 ; ed. 3, 

 p. 250 & in Grevillea iv. p. 23. Ojyegrapha saxigena var. 

 trochodes Taylor ex Leight. in Ann. Mag. Nat. Hist. ser. 2, 

 xiii. p. 93 (1854). Himularia Umhorina Nyl. in Flora li. p. 346 

 (1868); Cromb. Lich. Brit. p. 106; Leight. Lich. Fl. p. 406; 

 ocl. 3, p. 438. 



The name trochodes originated with Taylor in MS. ; he had 

 labelled a specimen of this lichen, collected in Carig Mt., Kerry, 

 Opegraplia saxigena var. trocJiodes. By an error Leigh ton and 

 Crombie have quoted this name as if published by Taylor under 0. 

 saxigena in Mackay Fl. Hib. ii. p. 259 (1836). 



Hab. On rocks. Eare in the N. Grampians of Scotland and in 

 S.W. Ireland. — B. M. Craig Guie, Braemar, Aberdeenshire ; Dun- 

 kerron, Kerry. 



144. L. subgyratula Nyl. in Flora Ivi. p. 296 (1873).— Thallus 

 thin and discontinuous, dark-brown or blackish, opaque, faintly 

 cracked. Apothecia black, small, tuberculate or gyrose ; hypo- 

 thecium blackish ; paraphyses slender, not distinct ; epithecium 

 brownish ; spores ellipsoid, 0,016 mm. long, 0,009 mm. thick ; 

 hymenial gelatine pale-blue then tawny-wine-red with iodine. — 

 Leight. in Grevillea iv. p. 26, t. 52, figs a, b, & Lich. Fl. ed. 3, 

 p. 250. 



Differs from the preceding in the more tuberculate apothecia and 

 in the smaller colourless spores. 



Hab. On granitic rocks. — B. M. Summit of Morrone, Braemar, 

 Aberdeenshire (the only locality). 



145. L. aglssa Sommerf. Suppl. Fl. Lapp. p. 144 (1826) ; 

 Nyl. Lich. Scand. p. 228. — Thallus indeterminate, thickish, 

 warted-areolate, the areolae tumid, convex somewhat shining, 

 yellowish (K + yellow, CaCl — , K(CaCl -)- yellow) ; hypothallus 

 black. Apothecia adnate, moderate, convex, immarginate, 

 somewhat shining, black ; paraphyses coherent, dark-greenish at 

 the apices, epithecium bluish-black ; hypothecium colourless or 

 sordid ; spores ellipsoideo-oblong, 0,010-16 mm. long, 0,006-8 mm. 

 thick ; hymenial gelatine deep-blue, the asci at length often sordid- 

 violet, with iodine. — Cromb. in Journ. Bot. viii. p. 99 (1870) ; 

 Leight. Lich. Fl. p. 275 ; ed. 3, p. 278. L. areolata Carroll 

 in Journ. Bot. iv. p. 24 (1866) (non Schser.) ; Cromb. Lich. Brit, 

 p. 82 ; Leight. Lich. Fl. p. 276 ; ed. 3, p. 279. Lichen miscellus 

 Sm. Engl. Bot. t. 1831 (1808) (non Ach.). 



Allied to L. fuscoatra, differing chiefly in the more massive 

 thallus, the thalline reactions, and the rather larger spores. The 

 areolae, at length somewhat rugose, are either crowded or more or less 

 scattered, in which latter case the hypothallus is more visible. The 

 apothecia, usually numerous, are only in a young state very thicklj^ 

 margined ; at times they are crowded, more convex, confluent and 

 diflbrm. The very common spermogones have the spermatia straight, 



