LECANORA. | LECANO-LECIDEET.. 363 
in Great Britain, the Channel Islands, and probably also in Ireland.— 
B.M.: Vale Castle, Island of Guernsey ; coast of Alderney. Reigate, 
Surrey; Glynde and Peasemarsh, Sussex; near Ryde, Isle of Wight ; 
Torquay and North Lynton, Devonshire; St. Maws, Cornwall ; near 
Buxton and Cromford, Derbyshire; Llanymynech Hill, Shropshire ; 
near Southerndown, Glamorganshire ; Manorbeer, near Tenby, Pem- 
brokeshire; Island of Anglesea; Bilsdale, Yorkshire; near Hartle- 
pra Durham; Arnbarrow, Westmoreland; St. Bees, Cumberland. 
sland of Lismore, and Barcaldine, Argyleshire ; West Water, Fifeshire ; 
Blair Athole, Perthshire ; Portlethen, Kincardineshire; near Aberdeen. 
Dunkerron, co. Kerry ; Cleghan, Connemara, co. Galway. 
Var. 3. brevilobata Nyl. Flora, 1883, p. 99.—Thallus moderate, 
unequally diffract, or verrucoso-areolate in the centre, shortly or 
obsoletely lobulate at the circumference. Apothecia and spores as 
in the type. 
Differs in the thalline characters given, the lacinie being also more dis- 
crete at the apices. The two Biitish specimens seen are but sparingly 
fertile. 
Hab. On schistose rocks in maritime and upland tracts.—Distr. Very 
rare in N.W. England and N.E. Scotland.—B. M.: Foreshield, Alston, 
Cumberland. Portlethen, Kincardineshire. 
14. L. cirrochroa Ach. Syn. (1814) p. 181; Ny]. Not. Siillsk. 
pro F. et Fl. F. Forh. v. p. 126.—Thallus orbicular, closely adnate, 
narrowly laciniate, bright orange-yellow, verruculose and citrino- 
sorediate towards the centre, radiate at the circumference, internally 
citrine; radii minute, somewhat convex, occasionally whitish- 
pruinose at the margins (K + purplish). Apothecia minute, 
scattered, plane, orange-coloured (K+ purple), the thalline margin 
subentire ; spores 0,013-18 mm. long, 0,005-6 mm. thick.—Cromb. 
Grevillea, xviii. p. 45.—Placodium cirrochroum Cromb. Journ. Bot. 
1874, p. 147; Leight. Lich. Fl. ed. 3, p. 161. Lecanora linearis 
Tayl. in Mack. Fl. Hib. ii. p. 260, according to a specimen from him- 
self in Hb. Brit. Mus., is only a very young state. 
Easily recognized by being internally citrine and superficially more or 
less citrino-sorediose. The thallus is small, rarely moderate (through the 
confluence of several thalli), with the radii slender. Specimens in which 
the radii become diffract and scattered (e. g. Taylor’s plant) closely 
approach LL, obliterans Nyl. (Flora, 1874, p. 7) and show that this, as 
suspected by Nylander, J. c.,is probably only a variety. With us it is 
always sterile. 
Hab. On caleareous rocks in maritime and upland districts.— Distr, 
Rather local and scarce in 8.W., Central, and N. England, in N. Wales; 
rare in the S.W. Hiehlands and the Central Grampians, Scotland, as also 
in S.W. Ireland.—B. M.: Sidmouth, Devonshire; Yatton and Weston- 
super-Mare, Somersetshire; Dovedale, Derbyshire ; Great Orme’s Head, 
Carnarvonshire ; Arnbarrow and near Milnthorpe, Westmoreland ; Alston, 
Cumberland. Island of Lismore, Argyleshire; Craig Tulloch, Blair 
Athole, Perthshire. Dunkerron, co. Kerry. 
15. L. lobulata Somm. Suppl. Lapp. (1826) p. 104; Nyl. Flora, 
1873, p. 1U5.—Thallus subeffuse, arcolutu-verrucose, thin, scarcely 
