LECANORA.] LECANO-LECIDEEI. 383 



Hab. On branches of trees in lowland districts. Distr. Apparently 

 very local and scarce in E. England (near Cambridge) ; no doubt to be 

 detected elsewhere. 



44. L. biloculata Xyl. Flora, 1878, p. 248. Thallus effuse, very 

 thin, unequal or rugulose, whitish or glaucous- white, somewhat 

 shining (K CaCl ). Apothecia minute, adnate, lecideoid, plane 

 and thinly margined, at length convex and immarginate, black 

 (K ); spores ellipsoid, polari-bilocular, brownish, 0,015-18 mm. 

 long, 0,008 mm. thick ; hypothecium brownish-black ; paraphyses 

 thickish, dark-brown at the clavate apices, hymenial gelatine deep 

 blue with iodine. Cromb. Grevillea, xviii. p. 46. Lecidea polo- 

 spora (nomen ineptum) ; Leight. Trans. Linn Soc. n. a. Bot. i. 

 (1878) p. 241, t. xxxiii. figs. 4-6 ; Lich. Fl. ed. 3, p. 313. 



A rather inconspicuous plant, with quite the aspect of a Lecidea allied 

 to L, myriocarpa, as observed by Leighton //. c. According to Nylander 

 apud Hue Rev. Bot. 188b', p. 20, it is in reality a Lecanora of this 

 section. It evidently, however, departs from it in the colour of the 

 apothecia and the spores, as also in the absence of any epithecial 

 reaction with K. In the small specimen seen, it is only sparingly present 

 associated with Lecanora ruyosa and Lecidea parasema. 



Hab. On an old hawthorn tree in a maritime tract. Distr. Extremely 

 local and rare in X.W. Ireland. B. M. : Ballinahinch, near Kylemore, 

 co. Galway. 



45. L. pyracea Xyl. Xot. Sallsk. pro F. et Fl. Fenn. Forh. n. 

 eer. v. (1866) p. 129. Thallus effuse, very thin, granulato-leprose, 

 greyish-white, often obsolete (Kf+ reddish in thin section); hypo- 

 thallus thin, whitish. Apothecia small or minute, somewhat plane 

 or convex, yellow-orange-coloured (K-f crimson), with the thalline 

 margin speedily excluded ; or biatorine with the proper margin thin, 

 paler yellow ; spores ellipsoid or oblongo-ellipsoid, polari-bilocular, 

 with longitudinal tube, 0,011-16 mm. long, 0,005-7 mm. thick. 

 Cromb. Grevillea, xviii. p. 46 ; Lich. Brit. p. 47 pro parte ; Leight. 

 Lich. Fl. p. 221 pro parte, ed. 3, p. 211 pro parte. Parmelia 

 cerina . pyracea Ach. Meth. (1803) p. 176. Brit. Exs.\ Leight. 

 n. 118; Mudd, n. 101 ; Larb. Lich. Hb. n. 132. 



In some respects allied to L. cerina, from which it differs chiefly in the 

 less developed thallus and the biatoroid apothecia. The thallus is usually 

 sparingly visible, and at times entirely wanting. The apothecia are 

 numerous, at first with thin, evanescent or obsolete thallbe margin, so 

 that they are seldom seen lecanorine. It is a rather variable plant, and 

 hence the British variety, forms, and subspecies that follow. 



Hab. On rocks and stones, rarely on trees and old pales from maritime 

 to subalpine tracts. Distr. Here and there in England and Wales, the 

 Scottish Grampians and X.W. Ireland ; no doubt often overlooked. B. M. : 

 Hastings and the South Downs, Sussex ; near Ryde, Isle of Wight ; near 

 Bovey Tracey, S. Devon; St. Merryn, Cornwall; near Cirencester, 

 Gloucestershire; near Cambridge; Barmouth, Merionethshire; Ingle- 

 borough, Lanbraugh, and near Easby, Cleveland, Yorkshire ; Stavelev, 

 Kendal, Westmoreland; Chollerford, Xorthuraberland. Ballachulish, 



