BACIDIa] LBCIDEACEjE 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 deducta Nyl. in Flora lii. p. 410 

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

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



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

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

 hypothecium and epithecium. The proper thallus, almost always 

 obscured by a foreign gelatinous thaUus, is only very sparingly 

 present in the specimens gathered. 



Hab. 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). ScoUciosporum 

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

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

 (PI. 12.) 



Thallus effuse, minutely squamulose or variously crustaceous. 

 Algal cells Protococcus. Apotheoia brightly coloured or dark, 

 sometimes carbonaceous (BapMospora), immarginate or with 

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

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

 spirally-curved {ScoUciosporum) . 



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

 forms of Lecideacece with acicular straight spores, but also ScoUcio- 

 sporum in which the spores are spirally curved, and JRaphiospora 

 which has been considered by some authors distinct on account of 

 the carbonaceous outer wall of the apothecium. 



1. B. pulvinata 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. 

 Apotheoia 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 pulvinata Tayl. in Mackay Fl. Hib. ii. p. 123 (1836) ; 

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



Characterized by the peculiar thallus which grows in small 

 scattered tumid roundish or difform pulvinate masses. The apotheoia 

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

 entirely barren. 



