1 l^^ LF.CANO-LECIDEEI [bILIMTIIA 



L'S. B. trachona Arnold in Flora Ixvii. p. 575 (1884). — 

 Tliallus effuse, thin, .sul)lei)ro.S(', minutf^ly ^ranulose or nearly 

 evanescent, whitish, greyish-white or greenish (K — , CaCl — ). 

 Apotliecia minute, plane, opaque, thinly margined, dark-brown, at 

 length convex and immarginate ; hypothecium brownish or some 

 what j)ale ; i)araphyscs scanty, slightly incrassate at the apices, not 

 well discrete ; epithecium nearly colourless or slightly })rownish- 

 black ; spores fusiform-oblong or fusiform, 1-3-septate, 0,011-19 

 mm. long, 0,0030-35 mm. thick ; hymenial gelatine bluish then 

 sordid-violet or wine-red with iodine. — Verrucaria trachona Ach. 

 Meth. Suppl. p. 16 (1803). Lecidca trachona Nyl. in Flora xlvii. 

 p. 620 (1864) ; Cromb. Lich. Brit. p. 71 ; Leight. Lich. Fl. p. 329 ; 

 ed. 3, p. 351. 



Exsicc. Larb. Ca\sar. n. 80. 



In our specimens the thalhis is sordid-greenish. Apotliecia and 

 spermogones are frequent ; when the latter only are present the plant 

 resembles superficially a Verrucaria. 



Hah. On granite rocks in maritime localities. — Distr. Rare in the 

 Channel Islands and S.W. England. — B. M. The Warren, Noirmont, 

 Jersey ; Dixcart Bay, Sark ; near Penzance, Cornwall. 



29. B. chlorococca Grsewe ex Stenh. in Ofvers. K. Vet. Akad. 

 Forh. 1862, p. 473. — Thallus thin, furfuraceous or granulose, dull- 

 yellowish-green. Apotbecia reddish-brown or black, minube, adnate, 

 convex, immarginate ; hypothecium colourless ; paraphyses gela- 

 tinous, distinct, dull-olive-green or pale ; spores fusiform, straight 

 or curved, 3-7-septate, 0,022-38 mm. long, 0.003-5 mm. thick ; 

 hymenial gelatine blue then dull- wine-red with iodine. 



Var. Mlarior Th. Fr. & Hult. Lich. Scand. p. 380 (1874).— 

 Apothecia reddish or reddish-brown ; paraphyses pale at the tips, 

 otherwise as in the type, which has not been found in Britain. 



Exs'icc. Larb. Lich. Hb. n. 351. 



Hah. On trees.— 5. M. Charnwood Forest, Leicestershire. 



30. B. subturgidllla A. L. Sm. — Thallus effuse, very thin, 

 greenish-white or obsolete. Apothecia small, scattered, convex, 

 immarginate, dark-brown or pale-leaden-coloured ; hypothecium 

 brown, whitish in upper layer ; paraphyses concrete ; epithecium 

 white or yellowish-white ; spores oblong, 0,008-14 mm. long, 

 0,003-4 mm. thick ; hymenial gelatine bluish then often tawny- 

 yellow with iodine. — Lecidea subturgidula Nyl. in Flora li. p. 343 

 (1868); Cromb. in Journ. Bot. vii. p. 48 (1869) & Lich. Brit, 

 p. 72 ; Leight. Lich. Fl. p. 324 ; ed. 3, p. 344. 



According to Nylander allied to L. apochroeella, a Finland species, 

 but differs in the larger spores and the colour of the hypothecium. 



Hah. On old stumps of holly. — B. M. Near Lyndhurst, New 

 Forest, Hants. 



31. B. deducta A. L. Sm. — ^Thallus effuse, very thin, leprose, 

 dispersed, greenish (K — , CaCl — ), scarcely visible. Apothecia 



