382 LICHENACEI. [LECAXORA. 



numerous, though elsewhere it often occurs sterile (fide Fr. fil. Lich. 

 Scand. p. 174), in which condition it has probably been overlooked in our 

 country. 



Hab. On shady rocks in upland situations. Distr. Local and scarce in 

 N. England and N.VV. Ireland. B. M. : Newton, Cleveland, Yorkshire; 

 Levens Park, Westmoreland ; Chollerford, Northumberland. Near Lough 

 Corrib and Great Killery, co. Galway. 



Form cyanopolia Nyl. Not. Sallsk. pro F. et Fl. Fenn. Forh. n. s. 

 v. (1866) p. 128. Thallus subleprose or depresso-granulate and 

 rimoso-diffract, sordid greyish or sometimes caesio-bluish. Apothecia 

 lecanorine, somewhat concave, at length biatorine, pale-yellowish- 

 orange. Cromb. Grevillea, xviii. p. 46. Lecanora cerina f. cyano- 

 polia Leight. Lich. Fl. ed. 3, p. 211. Brit. Exs. : Larb. Lich. Hb. 

 n. 23. 



Apparently referable to this subspecies, with which it agrees in habitat, 

 but differs in colour and in the tha^ine margin of the apothecia being at 

 length excluded. Our only specimen seen is well fertile. 



Hab. On wet stones in upland districts. Dixtr. Only sparingly in 

 N.W. Ireland. B. M. : Between Lough Feagh and Lough Muck, Con- 

 nemara, Galway. 



Subsp. 2. L. haematites Nyl. Mem. Soc. Cherb. v. (1857) p. 112. 

 Thallus subeff'use or determinate, contiguous, verruculose, greyish ; 

 hypothallus bluish. Apothecia submoderate, plane, rusty-red, the 

 thalline margin thickish, persistent. Cromb. Grevillea, xviii. p. 46. 

 Lecanora hcematites Charb. in St. Am. Fl. Agen. (1821) p. 492 ; 

 Leight. Lich. Fl. ed. 3, p. 212. Brit. Exs. : Larb. Lich. Hb. n. 56. 



Often regarded as a distinct species, but scarcely with propriety, since 

 it differs from the type chiefly in the colour of the apothecia. The thallus 

 is somewhat small, often confused with and at times limited by the hypo- 

 thallus. The apothecia, in the few specimens seen, are numerous and 

 crowded. 



Hab. On the sracoth bark of young trees and their branches, chiefly 

 in orchards, in maritime and lowland districts. Distr. Found only 

 sparingly in S.W., E., and W. England ; no doubt to be detected 

 elsewhere. B. M. : Ilsham, Torquay, S. Devon ; Cherry Hinton, Cam- 

 bridgeshire ; near Worcester. 



43. L. cerinella Nyl. Bull. Soc. Bot. t. xiii. (1866) p. 370; Flora, 

 1872, p. 427. Thallus thin, sordid-greyish, little visible (K + 

 yellowish). Apothecia minute, subbiatorine, bright-yellow (K + 

 purplish); spores 8-12-16nae, ellipsoid, indistinctly bilocular, with 

 thin septum, 0,009-0,011 mm. long, 0,005-6 mm. thick. Cromb. 

 Journ. Bot. 1882, p. 273. 



Looks as if it were a small variety of L. cerina, but is distinct by the 

 minute apothecia and the pluri-spored thecae. On the application of K, 

 the spores at once assume a placodine form, and are seen to be polari- 

 biloeular with longitudinal tube. 



