BIATORINA] LECIDEACEiE 131 



37. B. obturbans A. L. Sm. — Thallus indeterminate, thin, 

 rugose, unequal, greyish (K + yellowish, CaCl — ); hypothallus 

 black, limiting the thallus. Apothecia small, at first plane and 

 thinly margined, becoming convex and immarginate, blackish, 

 pale vrithin ; paraphyses not well discrete ; epithecium and 

 perithecium blackish; spores oblong, colourless, 0,010-11 mm. 

 long, 0,0035 mm. thick ; hymenial gelatine bluish then wine-red 

 with iodine. — Lecidea ohturbans Nyl. in Flora Ixix. p. 100 (1886) ; 

 Martind. in Naturalist, 1886, p. 101. Specimen not seen. 



Hab. On schistose rocks. Collected by J. M. Martindale near 

 Kendal, Westmoreland. 



38. B. subviridis A. L. Sm. — Thallus effuse, thin, continuous, 

 granulate-rugulose, somewhat shining, greenish or dark-green 

 (K — , CaCl — ). Apothecia sessile, minute, plane, thinly mar- 

 gined, black, whitish within ; paraphyses moderate ; epithecium 

 brown; hypothecium colourless; spores oviform, 0,011-16 mm. 

 long, 0,005-7 mm. thick ; hymenial gelatine bluish then tawny- 

 reddish with iodine. — Lecidea subviridis Nyl. in Flora Ivi. p. 297 

 (1873) ; Cromb. in Grevillea ii. p. 91 ; Leight. Lich. Fl. ed. 3, 

 p. 331. 



Well characterized by the Arthonia-like spores ; it is allied to 

 Lecidea arthoniza, a Scandinavian species. In the two small speci- 

 mens seen, the apothecia are only sparingly present. 



Hab. On siliceous stones in a maritime district. — B. M. Noirmont 

 Bay, Jersey (the only locality). 



39. B. supernula A. L. Sm. — Thallus absent. Apothecia 

 small, plane, and thinly margined, at length convex, immarginate, 

 black, concolorous within ; paraphyses moderate or rather 

 thick, bluish-black at the clavate apices ; hypothecium bluish- 

 black, brick-red above ; spores oblong-oviform, 0,009-14 mm. 

 long, 0,004-5 mm. thick ; hymenial gelatine wine-red with 

 iodine. — Lecidea supernula Nyl. in Flora lix. p. 574 (1876); 

 Cromb. in Grevillea v. p. 107 ; Leight. Lich. Fl. ed. 3, p. 389. 



An athalline plant very similar in the form of the ArtJwnia-like 

 spores to the preceding species. The apothecia are numerous and 

 usually several (3-6, rarely 8) aggregate. 



Hab. Parasitic on the thallus of Lecanora calcarea var. Hoffmanni 

 in a maritime tract. — B. M. Island of Lismore, Argyll (the only 

 locality). 



40. B. episema A. L. Sm. — Thallus absent. Apothecia small, 

 black, aggregate or solitary, plane or rarely convex, marginate, 

 the margin obtuse, entire ; hypothecium brown ; paraphyses 

 distinct, blackish at the tips of the clavate apices ; spores ellipsoid 

 or elongate-oblong, typically 1-septate, rarely 1-3-septate, 0,010- 

 18 mm. long, 0,004-5 mm, thick; hymenial gelatine bluish then 

 wine-red with iodine. — Lecidea episema Nyl. in Bot. Not. 1853, 



K 2 



