108 LECANO-LKCIDEEI [bIATOEELLA 



slender, discrete, often irregular ; epitheciuni minutely granulose, 

 yellow-ochraceous (K -f- rose-violet) ; hypothecium colourless ; 

 spores spherical, 0,0035-45 iiiiu. in diaineter ; hynienial gelatine 

 bluish with iodine. — Lecidea ochrophora Nyl. in Flora xlviii. 

 p. 355 (lcS65); Carroll in Journ. Bot. vii. p. 100 (1868); 

 Cromb. Lich. Brit. p. 75 ; Leight. Lich. Fl. p. 354 ; ed. 3, 

 p. 383. 



Distinguished amongst its allies by the ochrey-pulverulent 

 apothecia, which are at times several aggregate ; when the powdery 

 surface is rubbed off they become brown. 



Hah. Spreading over decayed mosses on trunks of trees in maritime 

 and upland districts. — Distr. Very local and rare in • the Channel 

 Islands and S.W. Ireland. — B. M. Eozel, Jersey ; Dinish, Killarney, 

 Kerry. 



3. B. moriformis Th. Fr. Lich. Scand. p. 401 (1874).— Thalius 

 effuse, thinnish or thin, granulose-leprose, greyish or brownish 

 grey (K -j- yellow, CaCl + red), often evanescent. Apothecia 

 submoderate or small, sessile, somewhat plane or convex, im- 

 marginate, blackish or brownish-black, greyish within ; paraphyses 

 very slender, indistinct, the epithecium seruginous-green or dark- 

 brownish olive ; hypothecium colourless ; asci tumid ; spores 

 globose, minute, 0,0025-35 mm. in diameter ; hymenial gelatine 

 deep-blue then dark with iodine. — B. resinse var. rnhicundulse 

 Mudd Man. p. 191 (1861). Arthonia moriformis Ach. Syn. p. 5 

 (1814). Lecidea tantilla Nyl. in Act. Soc. Linn. Bord. xxi. 

 p. 363 (1856); Cromb. Lich. Brit. p. 76; Leight. Lich. Fl. 

 p. 354 ; ed. 3, p. 382. L. improvisa Nyl. in Not. Sallsk. Faun. 

 & Fl. Fenn. iv. p. 233 (1859) ; Cromb. Lich. Brit. p. 76. 



The thalius, greyish-green when moist, varies somewhat in 

 thickness, and is often either almost absent or obliterated by other 

 lichens associated with it ; it usually spreads extensively over the 

 substratum, especially when subevanescent. The apothecia are 

 numerous, scattered or approximate, unequal, sometimes two together ; 

 when moistened, or when the plant grows in shady situations, they 

 are reddish-brown. The epithecium varies in colour from aeruginous- 

 green to olive-brown or to a bright brown (described as Sarcogyne 

 pinicola Massal. in Lotos 1856, p. 78 ; Biatorella pinicola Th. Fr. I. c). 

 Pycnidia occasionally occur, but they may not belong to the plant. 



Hab. On old palings in lowland and upland tracts. — Distr. Some- 

 what plentiful throughout England, rare in Wales, not recorded from 

 Scotland or Ireland. — B. M. Penshurst, Kent ; Eeigate, Surrey ; 

 Millhill, Middlesex ; Spetchley, Whittington and Hindlip, Worcester- 

 shire ; Stableford, Port Hill, near Shrewsbury, Neescliff, Wellington, 

 Upton Magna and Bomere Pool, Shropshire ; Nannau, Dolgelly^ 

 Merioneth ; near Redcar and Stokesley, Cleveland, Yorkshire. 



4. B. resinae Th. Fr. Lich. Arct. p. 199 (I860).— Thalius 

 effuse, very thin, leprose-granulose, greyish or greyish-green 

 (K — , CaCl — ), usually obsolete. Apothecia small or moderate, 

 adnate, somewhat concave or plane, pale-yellowish-brown or 



