1 20 LECANO-LECIDEEI [bIATORINA 



Hab. On decaying trunks and stumps of trees in wooded maritime 

 and upland districts. — Distr. Very local in S. England and the 

 S. Grampians, Scotland. — B. M. Shanlilin, I. of Wight ; Lymington, 

 Hants; near liuckfastleigh, Devon; Cirencester, Gloucestershire; 

 Loch Katrine, Perthshire (f. pallida). 



18. B. prasina Syd. Flecht. Deutschl. p. 166 (1887).— 

 Thallus effuse, thinnish, contiguous or scattered, subgranulose- 

 leprose, sordid-greenish (K — , CaCl — ). Apothecia minute, 

 innate-sessile, convex, immarginate, livid-brown or blackish, con- 

 colorous within ; paraphyses coherent ; epithecium and hypo- 

 thecium colourless ; spores oblong-ellipsoid, simple or 1 -septate, 

 0,011-12 mm. long, 0,004 mm. thick; hymenial gelatine bluish 

 then sordid-wine-red with iodine. — Micarea prasina Fr. Syst. 

 Orb. Veg. p. 257 (1825). Lecidea prasina Schser. Enum. p. 137 

 (1850); Mudd Man. p. 196; Leight. Lich. Fl. p. 263; ed. 3, 

 p. 261. L. prasiniza Nyl. in Flora Ivii. p. 312 (1874) & Ixiv. 

 p. 7 (1881); Cromb. in Journ. Bot. xiii. p. 141 (1875); Leight. 

 Lich. Fl. ed. 3, p. 338. 



Differs from B, erysiboides chiefly in the rather more developed 

 thallus, the colour of the smaller, more convex apothecia and the 

 often simple spores. The few British specimens gathered are well 

 fertile ; but the sterile pulverulent thallus spreads extensively over the 

 substratum. 



Hab. On old trunks of trees in a maritime locality. — Distr. Eare 

 in England and S.W. Highlands of Scotland. — B. M. Lyndhurst, 

 Hants ; Barcaldine, Argyll. 



Var. byssacea A. L. Sm. — Thallus minutely granular, dirty- 

 greenish. -^ Apothecia dark ; paraphyses dark at the tips. — Biatora 

 byssacea Zwackh. in Flora xly. p. 510 (1862). Lecidea erysiboides 

 f. sordidescens Nyl. ex Norrlin in Not. Siillsk. Faun. & Fl. Fenn. 

 n. ser. viii. p. 208 (1871) ; Cromb. Lich. Brit. p. 72 ; Leight. Lich. 

 Fl. p. 323 ; ed. 3, p. 343. Biatorina prasiniza L byssacea Arnold 

 Lich. Fl. Munch, p. 24 (1897). 



Differs from the type in the darker colour of the apothecia and 

 of the paraphyses. 



Hab. On old decorticated trees. — B. M. Lyndhurst, New Forest, 

 Hants. 



19. B. globulosa Koerb. Syst. Lich. Germ. p. 191 (1855).— 

 Thallus effuse, very thin, granulose-pulverulent, whitish (K — , 

 CaCl — ), often evanescent. Apothecia small, adnate, convex, 

 immarginate, blackish or leaden-black, greyish within ; para- 

 physes concrete ; epithecium blackish ; hypothecium pale or 

 slightly sordid above ; spores oblong or fusiform-oblong, simple 

 or thinly l-septate, 0,009-0,014 mm. long, 0,002-4 mm. thick; 

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

 Lecidea globulosa Floerke Deutsche Lich. lief. 10, p. 1 (1821); 

 Carroll in Journ. Bot. v. p. 256 (1867) ; Cromb. Lich. Brit. 



