LECAXORA.] LECAtfO-LECIDEEI. 433 



Hub. On the trunks of trees and on old pales, especially fir, in mari- 

 time and upland districts. Distr. Probably general in Great Britain, 

 usually plentiful where it occurs ; rare in the Channel Islands and S. 

 Ireland. B. M. : Beauport Bay, Island of Jersey. Lydd, Kent ; New 

 Forest, Hants ; near Torquay and Totness, S. Devon ; Roche, Cornwall ; 

 Malvern, Worcestershire ; near Ludlow, Herefordshire ; Bettws-y-Coed 

 and Trefriw, Carnarvonshire ; Staveley, near Kendal, Westmoreland ; 

 Ennerdale, Cumberland. New Galloway, Kirkcudbrightshire ; Barcal- 

 dine, Argyleshire ; Craig Calliach and near Loch Tutnrnel, Perthshire ; 

 near Forfar ; Durris, Kincardineshire ; Countesswells Wood, near Aber- 

 deen, and Mar Forest, Braemar, Aberdeenshire ; Rothiemurchus Woods, 

 Inverness-shire. Glenbower Wood and Castlebernard Park, co. Cork. 



Var. y. smaragdocarpa Nyl. Flora, 1872, p. 248, nota 1. 

 Thallus as in the type. Apothecia bright emerald-green. Cromb. 

 Grevillea, xviii. p. 69. 



From the peculiar colour of the apothecia to be regarded as a distinct 

 variety. In the only British specimen the thallus is scarcely visible, 

 though the apothecia are somewhat crowded, convex, with the margin at 

 length excluded. 



Hab. On decorticated stumps of oak in an upland district. Distr. Very 

 rare in Central England. B. M. : Summit of the Chiltern Hills, Oxford- 

 shire. 



Subsp. L. inversa Xyl. Flora, 1879, p. 361. Thallus nearly as 

 in the type. Apothecia small, the thalline margin distinct, per- 

 sistent, subentire, epulverulent ; spores not seen. Cromb. Grevillea, 

 xviii. p. 69. 



As observed by Nylander I, c. the thallus (which is somewhat firmer) 

 agrees in the reaction with L. e.rpailens, while the thalline margin of the 

 apothecia is subsimilar to that of L. varia. Were the spores known, it 

 might probably be a distinct species. 



Hab. On the branches of furze in an upland district. Distr. Only a 

 fragmentary specimen from S.W. Ireland (s. n. Lecanora albo-Jlavida 

 Tayl. nov. sp.). B.M.: Finnechy River, co. Kerry. 



119. L. symmicta Ach. Syn. (1814) p. 340 ; Nyl. Flora, 1872, 

 p. 249. Thallus subeffuse, thin or very thin, subleprose or 

 minutely granulose, pale yellowish-green or whitish- straw-colonred 

 (K + yellow, CaCl + orange). Apothecia small, biatorine, at first 

 plane with thin, entire margin, speedily convex and immarginate, 

 pale-yellow or pale-testaceous, partly olivaceous ; spores oblong, 

 0,011-14 mm. long, 0,004-5 mm. thick; paraphyses slender, not 

 very well discrete ; hymenial gelatine bluish, then sordid-yellow 

 with iodine. Cromb. Grevillea, xviii. p. 69. Lecanora symmicta 

 Leight. Lich. Fl. ed. 3, p. 183 (excl. vars.). Lecanora varia 

 . symmicta Ach. Lich. Univ. (1810) p. 379; Mudd, Man. p. 150 

 pro parte ; Cromb. Lich. Brit. p. 52 pro parte ; Leight. Lich. Fl. 

 ed. 1, p. 193 pro parte. 



May be recognized from its more immediate allies chiefly by the con- 



2F 



