148 LECANO-LECIDEEI [bILIMBIA 



■2S. B. trachona Ai-nold in Flora Ixvii. p. 575 (1884). — 

 ThaUus effuse, thin, subleprose, minutely granulose or nearly 

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

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

 length convex and immarginate ; hypothecium brownish or some- 

 what pale ; paraphyses scanty, sUghtly incrassate at the apices, not 

 well discrete ; epitheciiim nearly colourless or slightly brownish- 

 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. — Vermcaria trachona Ach. 

 Meth. Suppl. p. 16 (1803). Lecidea trachona Kyi. in Mora xlvii. 

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

 ed. 3, p. 351. 



Exsicc. Larb. Caesar, n. 80. 



In our specimens the thaUus is sordid-greenish. Apothecia and 

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

 resembles superficially a Vermcaria. 



Hob. On granite rocks in maritime locaUties. — Distr. Eare in the 

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

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



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

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

 yellowish-green. Apothecia reddish-brown or black, minute, adnate, 

 convex, immarginate ; hypothecium colourless ; paraphyses gela- 

 tinous, distinct, dull-oHve-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 duU-wine-red with iodine. 



Yaw hilarior 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. 



Exsicc, Larb. Lich. Hb. n. 351. 

 Hah. On trees. — B. M. Chamwood Forest, Leicestershire. 



30. B. subturgidula A. L. Sm. — ThaUus effuse, very thin, 

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

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

 brown, whitish in upper layer ; paraphyses concrete ; epithecium 

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

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

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

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

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



According to Nylander aUied to L. apochraeella, a Finland species, 

 but differs in the larger spores and the colour of the hj-pothecinm. 



Hoi. On old stumps of holly. — B. M. Xear Lyndhurst, Kew 

 Forest, Hants. 



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

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



