144 LECANO-LECIDEEI [bILIMBIA 



coherent ; epithecium coloui-less ; hypothecium brownish ; spores 

 very variable, 5-9-septate, 0,028-50 mm. long, 0,007-11 mm. 

 thick ; hymenial gelatine deep-blue -with iodine. — Lecidea luhen» 

 Nyl. in Flora Ivii. p. 311 (1874) ; Cromb. in Grevillea iii. p. 23 ; 

 Leight. lich. Fl. ed. 3, p. 366. 



Differs in the usually lighter coloured apothecia and the larger 

 spores. 



Hah. On trunks of trees. — B. M. Shiere, Surrey (the onlylocaUty). 



20. B. subviridescens A. L. Sm. — ThaUus effiise, very thin, 

 greenish or sordid-greenish, opaque, often obsolete. Apothecia 

 small, convex, immarginate, brown or Uvid-brown, opaque, dark 

 within ; paraphyses coherent ; epithecium and hypothecium pale 

 or brownish; spores oblong, simple or 1-3-septate, 0,011-18 

 mm. long, 0,004—6 mm. thick ; hymenial gelatine bluish then 

 wine-red with iodine. — Lecidea subviridescens Nyl. in Flora li. 

 p. 474 (1868) ; Leight. in Ann. Mag. Nat. Hist. ser. 4, iii. p. 267 

 (1869) & Lich. Fl. p. 324 ; ed. 3, p. 344 ; Cromb. Lich. Brit, 

 p. 7L 



Characterized by the darker, thinner thaUus, the darker apothecia 

 and the smaller spores. 



Hah. Incrusting mosses or on the ground. — Distr. Somewhat 

 rare in the Channel Islands and S. England. — B. M. Boulay Bay, 

 Jersey ; Ventnor, I. of Wight. 



Var. trisepta A. L. Sm. — Thallus subdeterminate or effuse, 

 very thin, subgranulose, dark-greyish or blackish, at times nearly 

 obsolete. Apothecia minute, irregularly congregate, black ; 

 hypothecium colourless ; spores obtusely fusiform, 3-septate, 

 0,0014-22 mm. long, 0,004-5 mm. thick ; hymenial gelatine 

 bluish then, especially the asci, violet or wine-reddish with iodine. 

 — Biatora trisepta Naeg. ex ilueU. in Mem. Soc. Phys. Hist. ISTat. 

 Genev. xvi. p. 404 (1862) ^de Th. Fr. Lich. Scand. p. 382 (1874). 

 Lecidea ternaria Nyl. in Flora Ix. p. 232 (1877) ; Leight. Lich. 

 Fl. ed. 3, p. 358 ; Cromb. in Grevillea xxii. p. 58. Lecidea 

 sabuletorum var. milliaria f. ternaria Nyl. in Not. Sallsk. Faun. 

 & Fl. Fenn. n. ser. v. p. 151 (1866). 



Exsicc. Mudd n. 157 ; Iiarb. lich. Hb. without number. 



Differs from the type in the darker thaUus, and the somewhat 

 smaller constantly 3-septate spores. 



Hob. On moss and stones. — Distr. Bare throughout the British 

 Isles. — B. M. Baysdale Moor and Lounsdale, Cleveland, Torkshire ; 

 I. of Lismore, ^gyU ; Doughruagh Mt., and near Kylemore, Con- 

 nemara, Galway. 



21. B. lignaria Massal. Ric. Lich. p. 121 (1852) pro parte. — 

 ThaUus effuse, granulose or subpulverulent, thinnish, greyish- 

 green or whitish or almost obsolete (K + yellowish, CaCl + 

 reddish). Apothecia small, sessile or adnate, convex, hemi- 



