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 Nyl. 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. 5. 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 J. c. According to Nylander 
apud Hue Rev. Bot. 1886, p. 29, 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 Lecvanora rugosa and Lecidea parasema, 
Hab. On an old hawthorn tree in a maritime tract.—Distr. Extremely 
local and rare in N.W. Iveland.—B. M.: Ballinahinch, near Kylemore, 
co. Galway. 
45. L. pyracea Nyl. Not. Sallsk. pro F. et Fl. Fenn. Férh. n. 
ser. v. (1866) p. 129.—Thallus effuse, very thin, granulato-leprose, 
greyish-white, often obsolete (Kf+ reddish in thin section); hypo- 
thallus thin, whitish. Apothecia smal) or minute, somewhat plane 
or convex, yellow-orange-coloured (K+ 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. (1808) 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 thalline 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 N.W, Ireland ; no doubt often overlooked.—B. M.: 
Hastings and the South Downs, Sussex ; near Ryde, Isle of Wight; near 
Bovey Tracey, 8. Devon; St. Merryn, Cornwall; near Cirencester, 
Gloucestershire; near Cambridge; Barmouth, Merionethshire; Ingle- 
borough, Lanbraugh, and near Hasby, Cleveland, Yorkshire; Staveley, 
Kendal, Westmoreland; Chollerford, Northumberland. Ballachulish, 
