LECANORA. | LECANO-LECIDEEI. 435 
Var. 6. aitema Nyl. Flora, 1873, p. 229.—Thallus somewhat 
thickish, leprose, bright yellow. Apothecia small or submoderate, 
convex, lecideoid, black ; spores 0,012-17 mm. long, 0,0045-55 
mm. thick.—Cromb, Grevillea, xviii. p. 69.—Lecanora varia var. 
aitema Cromb. Lich. Brit. p.52; Leight. Lich. Fl. p.192. Z. sym- 
micta var. aitema ed. 3, p. 183. Lecrdea aitema Ach. Lich. Univ. 
(1810) p. 178, Lecanora varia £. denigrata (non Fr.), Mudd, Man. 
p. 151.— Brit, Exs.; Cromb. n. 66; Larb. Lich. Hb. n. 255; 
Mudd, n. 118. 
Looks entirely as if a Lecidea, near L. parasema. It is, however, 
only a variety of this species, with which it agrees in the reactions, but 
differs in the more leprose thallus and the colour of the apothecia. The 
thallus at times occurs in small determinate macula and is always well 
fertile, the apothecia being colourless within. A state in which there 
are few or no traces of a thallus, with the apothecia crowded and often 
less convex, is form depauperata Oromb. Grevillea J. c. 
Hab, On old palings in upland districts — Distr. Not infrequent in Great 
Britain ; not seen from Ireland or the Channel Islands—B.M.: Near 
Lyndhurst, New Forest, Hampshire; Shanklin, Isle of Wight; Dart- 
moor, 8. Devon; near Millhill, Middlesex; near Gamlingay, Cambridge- 
shire; Battersby, Cleveland, Yorkshire; Alston, Cumberland. Finlarig, 
Kenmore, and Glen Lyon, Killin, Glen Fender, Blair Athole, Perth- 
shire ; Crathie, Braemar, Aberdeenshire ; Rothiemurchus, Inverness-shire, 
121. L. trabalis Nyl. Flora, 1877, p. 458.—Thallus effuse, 
glebuloso-granulate, subverrucoso-diffract, thinnish or submoderate, 
greyish (K+ yellowish, CaCl—). Apothecia small, adnate, some- 
what convex, immarginate, pale-livid, sordidly pale-testaceous or 
livid-blackish ; spores rarely spuriously 1-septate, oblong, 0,009-- 
0,014 mm. long, 0,0035-45 mm. thick; epithecium granulose, 
paraphyses slender ; hymenial gelatine bluish, then subincolorous 
(the thece subpersistently bluish) with iodine.—Lecidea sceepincola 
var. trabalis Ach, Syn. (1814) p. 35. 
Allied to Z. symmictera, of which Nylander J. c. says it may perhaps 
be a subspecies, In the British specimens, one of which was recently 
determined by him, the thallus is chiefly dark-grey from age. The 
apothecia are numerous and often difformi-connate. 
Hab. On a detorticated stump of hornbeam oak in a wooded upland 
tract.—Distr. As yet only sparingly in E. England.—B. M.: Highbeech, 
Epping Forest, Essex. 
122. L. piniperda Koerb. Par. Lich. (1865) p. 81.—Thallus 
effuse, thin, verruculoso-leprose, whitish (Kf+ yellowish, CaCl—). 
Apothecia minute, plane or convex, subcarneous or brownish, 
pruinose, the thalline margin pale, thin, entire, or subcrenulate, at 
length excluded; spores oblongo-ellipsoid, 0,008-12 mm. -long, 
0,004-5 mm. thick ; hymenial gelatine deep blue, then tawny with 
iodine.—Cromb. Journ. Bot. 1873, p. 183; Leight. Lich. Fl. ed. 3, 
p. 174.—Brit. Hxs.: Leight. n. 176; Cromb. n. 160. 
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