LECANOKA.] Liji.'ANo-MX'i ui;i;r. 'M'-i 



in (Jreat Britain, the Channel Islands, and probably also in Ireland. — 

 ]{. M. : Vale Castle, Island of (inernsey ; coast of Alderney. JJi'ijrate, 

 Surrey; (ilynde and Pea-itMnar.-h, Sussex; near Uyde, Isle of Wight ; 

 Torquay and North Lynton, Devonshire; St. Maws, Corinvall ; near 

 Jkixton and Croinford, Derbyshire; Llanynivnech Hill, Sliroi\shire ; 

 near Southerndown, Cilanior<ransiiire ; .Manorbeer. near Tenby, I'eni- 

 brokesiiire ; Island of Anj^lesea ; Bilsdale, Yorkshire ; near Hartle- 

 pool, Durham; Arnbarrow, Westmoreland; St. Rets, Cumberland. 

 Island ol" Jjismore, and Darcaldine, Argyleshire ; West Water, Fifesliire ; 

 Bhiir Athole, Perthshire; Portlethen, Kiuc;irdineshire; near Aberdeen. 

 Duukerrou, co. Kerry ; Cleghau, Connemara, oo. Galway. 



Var. /?. brevilobata Xyl. Flora, 1883, p. OD, — ThuUus 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 lar-iniae being also more dis- 

 crete at ihe apices. The two Bi itish specimens seen are but sparingly 

 fertile. 



Hah. On schistose rocks in maritime and upland tracts, — Di^tr. ^'ery 

 rare in N.W. England and N.E. Scotland. — B. M. : Foreshield, Alston, 

 Cumberland. Portlethen, Kincardineshire. 



14. L. cirrochroa Ach. Syn. (1814) p. 181 ; ?^yl. Not. Sallsk. 

 pro F. et Fl. F. Forh. v. p. 126.^ — Thallus orbicular, closely adiiate, 

 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 -f purplish). Apothecia minute, 

 scattered, plane, orange-coloured (K-l-puii^le), the thalline margin 

 subentire ; spores 0,013-18 mm. long, 0,005-6 mm. thick. — Cromb. 

 Grevillea, xviii. p. 45. — PlacoJiuni cirrochroum Cromb. Journ. Eot. 

 1874, p. 147 ; Leight. Lich. Fl. ed. 3, p. 101. Lecanom linearis 

 Tayl. ill ilack. Fl. Hib. ii. p. 2G0, according to a specimen from him- 

 self in Hb, Brit. Mus., is only a very young state. 



Easily recognizi d by being internally citrine and superficially more or 

 less citrino-sorediose. The thallus is small, rarely moderate (through the 

 confluence of several thallij, with the radii slender. Specimens in which 

 the radii become diffract and scattered (e. (/. Taylor's plant) closely 

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

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

 always sterile. 



Hah. On calcareous rocks in maritime and upland districts. — Di-itr. 

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

 rare in the S.W. Hi<ihlauds and the Central Grampians, Scotland, as also 

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

 super-Mare, Somersetshire ; Dovedale, Derby.shire ; Great ()rme's Head, 

 CarnarYon.shire ; Arnbarrow and near Milnthorpe, A^'estmoreland ; Alston, 

 Cumberland. Island of Lismore, Argyleshire ; Craig Tulloch, Blair 

 Athole, Perthshire. Dunkerron, co. Kerry. 



15. L. lobiilata Somm. Suppl. Lapp. (1>2(>) p. 104: Xyl. Flora, 

 1^7'"', p. 1<'5. — Tluillus subcfl'usc; areolutu-vcirucobc. thin, scarcely 



