LECANORA. | LECANO-LECIDEEI. 361 
Island of Jersey. Near Glynde, Sussex; Kemble, Gloucestershire ; 
Weston, Oxfordshire ; Llanymynech Hill, Shropshire; Ayton, Cleveland, 
Yorkshire; Broughton Castle, Westmoreland. The Trossachs, Perth- 
shire; Cove, Kincardineshire; near Aberdeen. 
Form Arnoldi Nyl. Flora, 1883, p. 106.—Thallus very small, 
epruinose, cinuabarine, shortly and narrowly radiose, diffracto- 
areolate in the centre. Apothecia minute, concolorous with the 
thallus.—Cromb. Grevillea, xviii. p. 44.—Lccanora Arnoldi Wedd. 
Bull. Soc. Bot. xxiii. (1876) p. 96. ZL. miniata Tayl. in Mack. Fl. 
Hib. ii. p. 140. 
Only a minute condition of the type with naked miniate thallus and 
apothecia. The three British specimens seen are well fertile. 
Hab, On dry calcareous rocks in maritime and mountainous districts. 
—Distr. Only in N.E. England, the N. Grampians, Scotland, and S.W. 
Treland.—B. M.: Hartlepool, Durham. Morrone, Aberdeenshire. Dun- 
kerron, co. Kerry. 
Var. GB. obliterascens Nyl. Flora, 1883, p. 99.—Thallus small, 
slightly and narrowly radiate at the circumference, vitelline. Apo-- 
thecia small, plane or convex, the thalline margin at length often 
obliterated ; spores 0,008-0,011 mm. long, 0,004-5 mm. thick.— 
Cromb. Journ. Bot. 1885, p. 195. 
According to Nylander J. c., apparently only a variety of this sub- 
species. In our British specimens, it occurs on the substratum in small 
scattered patches, which occasionally have a tendency to become con- 
fluent. The apothecia are numerous and crowded, almost obliterating 
the thallus. 
Hab, On schistose rocks and walls in maritime and upland districts. 
— Distr. Found only in N. England, the Central Grampians, and N.E. 
Scotland.—B. M.: Near Ayton, Cleveland, Yorkshire; Bassenthwaite, 
Cumberland. Craig Tulloch, Blair Athole, Perthshire; Cove, Kin- 
cardineshire. 
12. L. dissidens Nyl. Flora, 1875, p. 298.—Thallus orbicular, 
appressed, somewhat small, stellato-radiate, vitelline ;_ lacinice 
narrow, plane or somewhat convex, discrete, subfree at the circum- 
ference (K+ purplish), Apothecia small, plane, concolorous (K+ 
purplish), the thalline margin subentire or crenulate ; spores 
0,009-0,016 mm. long, 0,005-7 mm. thick.—Cromb. Grevillea, iv. 
p. 180.—Placodium murorum form dissidens Leight. Lich. Fl. ed. 3, 
p. 161. Lichen flavicens With. Arr. ed. 3, iv. p. 25 pro parte.— 
Lichen elegans Eng. Bot. t. 2181 (right-hand fig.). 
Looks like a variety of ,D. elegans, but is distinguished by the colour 
(rarely subminiate) of the planer lacini. It approaches states of 
subsp. L. tegularis, but the lacinie are more discrete, and the thalline 
margin of the apothecia usually more or less crenate. The British 
specimens are well fertile. 
Hab. On slate roofs of outhouses and on brick walls in lowland and up- 
land tracts —Distr. Found only here and there in England, but probably 
