110 LECAXO-LECEDEEI [bIATOKINA 



black, innate, plane or often angular and mnbonate, with a thin 

 flexuose margin ; hypothecium colourless or brownish ; paraphyses 

 discrete, bluish-green or dark-brown at the apices ; spores 

 spherical or subellipsoid, 0,003-4 mm. long, 0,002-3 mm. thick. — 

 Lecidea Morio Ft. Lich. Eur. p. 319 (1831) ; Cromb. Lich. Brit, 

 p. 84 ; Leight. Lich. Fl. p. 353 ; ed. 3, p. 382. 



Has much the appearance of Lecidea fuscoatra. 



Sab. On rocks. — Distr. Somewhat imcommon in maritime, or 

 chiefly in alpine districts in England and Scotland, not recorded from 

 Ireland. — B. M. Barmouth, near DogeUy, and Cader Idris, Merioneth ; 

 Yorkshire ; Ben Lawers, Perthshire ; Morrone, Braemar, Aberdeenshire. 



Var. cinerea Mudd 7. c. — ThaUus cracked-areolate, the areolse 

 crowded towards the centre, greyish-brown, less distinctly 

 effigurate at the circumference. Otherwise as in the type. — 

 Lecidea Morio-ra.r. cinerea Schaer. Enum. p. 108 (1850). Specimen 

 not seen. 



Mudd cites Leighton's Exsicc. L. fuscoatra n. 304, but the speci- 

 men of this number in the British Museum belongs to L. fuscoatra. 



Hah. On rocks. — Distr. Wales (Barmouth, Merioneth) and X. 

 England. 



73. BIATORINA Massal. Eic. Lich. p. 134 (1852) emend. ; 

 Mudd Man. p. 175 (1861). Thalloidima Massal. I.e. p. 95; 

 Mudd Man. Z. c. p. 172. Catillaria Massal. 1. c. p. 78. (PI. 10.) 



ThaUus minutely squamulose (Tlialloidima), turgid or variously 

 cmstaceous, sometimes evanescent or wanting. Algal cells Pro- 

 tococcus or rarely TrentepohUa. Apothecia either light-coloured 

 and biatorine (Biatorina) or black and lecideine {CatiUaria), the 

 proper margin often obliterated ; spores usually 8 in the ascus, 

 ellipsoid or oblong, usually 1-septate, colourless. 



Massalongo described three genera, Thalloidima, Catillaria and 

 Biat(yrina, which differ slightly in the form of the thallus and the 

 texture of the apothecia, but are all characterized by the colourless 

 usually 2-ceUed spores. Mudd united Catillaria and Biatorina under 

 the latter, retainii^ Thalloidima as a separate genus. 



1. B. coeinleonigricans A. L. Sm. — Thallus determinate, 

 squamulose, usually bluish-grey-pruinose, pale-brown, glaucous 

 or bluish-black (K — , CaCl — ) ; squamules smooth, turgid-plicate 

 in the centre, roundly lobed at the circumference. Apothecia 

 sessile, moderate, plane or somewhat convex, bluish-black, bluish- 

 grey-pruinose or naked, the margin thick, obtuse, occasionally 

 flexuose, at length excluded ; paraphyses dark-brown at the 

 apices ; hypothecium reddish- or dark-brown ; spores subfusi- 

 form or subacicular, 0,018—30 mm. long, 0,002—4 mm. thick ; 

 hymenial gelatine bluish then wine-red with iodine. — Lichenoides 

 glaueum, squamis crassis, hrevissimig DiU. Hist. Muse. p. 228, 

 t. 30, f. 135 (1740). Lichen coeruleonigricans Lightf. M. Scot. ii. 



