BACIDIa] LECIDEACEJE 149 



subminute, blackish, somewhat plane and thinly margined, then 

 convex and immarginate, reddish in thin section ; hypothecium 

 darker in the middle ; paraphyses not discrete ; spores ellipsoid 

 or oblong, 3-septate, colourless, brownish in the mass, 0,010-13 

 mm. long, 0,0035-45 mm. thick ; hymenial gelatine bluish then 

 wine-reddish with iodine. — Lecidea dcducta Nyl. in Flora lii. p. 410 

 (1869); Cromb. in Journ. Bot. vii. p. 233 (1869) k Lich. Brit, 

 p. 72 ; Leight. Lich. Fl. p. 328 ; ed. 3, p. 349. 



Distinguished from the preceding, to which it is closely related, 

 chiefly by the colour of the apothecia, but also by that of the 

 hypothecium and epithecium. The proper thallus, almost ahAays 

 obscured by a foreign gelatinous thallus, is only very sparingly 

 present in the specimens gathered. 



Hah. On old stumps of holly. — B. M. Near Brockenhurst, New 

 Forest, Hants. 



75. BACIDIA De Not. in Giorn. Bot. Ital. ii. p. 189 (1846) 

 emend. ; Th. Fries Lich. Arct. p. 179 (1860). Scoliciosporum 

 Massal. Ric. Lich. p. 104 (1852) ; Mudd Man. p. 185. Baphio- 

 spora Massal. Ale. Gen. Lich. p. 11 (1853) ; Mudd Man. r>. 186. 

 (PI. 12.) 



Thallus effuse, minutely squamulose or variously crustaceous. 

 Algal cells Protococcus. Apothecia brightly coloured or dark, 

 sometimes carbonaceous (Raphiospora), immarginate or with 

 proper margin only ; asci usually 8-spored ; spores elongate, 

 acicular, colourless, pluri-septate, usually straight or sometimes 

 spirally-curved {Scoliciosporum). 



The genus Bacidia, as here understood, includes not only those 

 forms of Lecideacew with acicular straight spores, but also Scolicio- 

 sporum in which the spores are spirally curved, and Baphiospora 

 which has been considered hy some authors distinct on account of 

 the carbonaceous outer wall of the apothecium. 



1. B. puivinata Mudd Man. p. 185 (1861).— Thallus indeter- 

 minate, thickish, pulvinate, granulose-squamulose, the squamules 

 minute, congregate in subconvex tufts, pale-greenish-brown or 

 cream-coloured (K — , CaCl — ); hypothallus thickish, black. 

 Apothecia small, at first concave, then plane with thick obtuse 

 margin, at length convex and immarginate, black, concolorous 

 within ; paraphyses slender, conglutinate ; epithecium deep- 

 yellow ; hypothecium thick, dark- reddish-brown (K-(- blackish) ; 

 spores acicular or slightly clavate, straight or somewhat curved, 

 3-7-septate, 0,020-38 mm. long, 0,003-5 mm. thick ; hymenial 

 gelatine, especially the asci, bluish then wine-red with iodine. — 

 Lecidea puivinata Tayl. in Mackay Fl. Hib. ii. p. 123 (1836); 

 Cromb. Lich. Brit. p. 75 ; Leight. Lich. Fl. p. 345 ; ed. 3, p. 372. 



Characterized by the peculiar thallus which grows in small 

 scattered tumid roundish or difform pulvinate masses. The apothecia 

 are not numerous in the specimens seen, some of the tufts being 

 entirely barren. 



