LECANORA.] LECANO-LECIDEEI. 303 



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 ; Llanyraynech Hill, Shropshire ; 

 near Soulherndown, Glamorganshire ; Manorbeer, near Tenby, Pem- 

 brokeshire ; island of Anglesea ; Bilsdale, Yorkshire ; near Hartle- 

 fool, Durham ; Arnbarrow, Westmoreland ; St. Bees, Cumberland, 

 sland of Lismore, and Barcaldine, Argyleshire ; West Water, Fifeshire ; 

 Blair Athole, Perthshire; Portlethen,'Kiucardineshire; near Aberdeen. 

 Dunkerron, co. Kerry ; Cleghan, Conuemara, co. Galway. 



Var. ft. brevilobata Nyl. Flora, 1883, p. 99. Thallus moderate, 

 unequally diffract, or verrncoso-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 laninia? being also more dis- 

 crete at the apices. The two Biitish specimens seen are but sparingly 

 fertile. 



Hub. 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. 



H. L. cirrochroa Ach. Syn. (1814) p. 181 ; Nyl. Not. Sallsk. 

 pro F. et FL F. Forh. v. p. 126. Thallua orbicular, closely aclnate, 

 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 L. obliterans Nyl. (Flora, 1874, p. 7) and show that this, as 

 suspected by Nylander, I. c., is probably only a variety. With us it i 

 always sterile. 



Hab. On calcareous rocks in maritime and upland districts. Distr. 

 Rather local and scarce in S.W., Central, and N. England, in N. Wales; 

 rare in the S.W. Highlands and the Central Grampians, Scotland, as also 

 in S.W. Ireland. B. M. : Sidmouth, Devonshire ; Yatton and Weston- 

 puper-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. (1^26) p. 104; Nyl. Flora, 

 1S7-5, p. 105. Thallus subeffusc, areoluto-vcirucose, thin, scarcely 



