LECAXORA.] LECANO-LECIDEEI. 473 



Lawers, Perthshire : near Portlethen, Kincardineshire ; Morrone, Braemar, 

 Aberdeenshire. Kilcully, near Cork; Kilkee, co. Clare; Doughruagh 

 and Maaiu nits., Connemara, co. Galway ; Black nit., co. Antrim. 



Form obscurata Nyl. Flora, 1872, p. 364. Thallus dark- or 

 olive-greyish. Apothecia and spermogones as in the type. Leight. 

 Lich. Fl. ed. 3, p. 195. ParmeUa cinerea var. obscurata Fr. fil. 

 Lich. Suec. n. 343. Brit. Exs.: Leight. n. 175 ; Mudd, n. 135. 



Variously placed by authors, but evidently referable to this species, 

 with which, except in the darker thallus, it entirely agrees. In this 

 respect, however, transition states at times occur. 



Hob. On rocks and boulders in upland and subalpine tracts. Distr. 

 Found only in a few localities in Great Britain and S.W. Ireland. 

 B. M. : Malveru Hills, Worcestershire ; Caer Caradoc, Shropshire ; Cliff- 

 rigg, Cleveland, Yorkshire ; Restou Scar, Staveley, Westmoreland. 

 King's Park, Stirling; Craig Tulloch, Blair Athole, Perthshire; Mor- 

 rone, Braemar, Aberdeenshire. Killarney, co. Kerry. 



171. L. laevata Nyl. Flora, 1872, p. 364, 1881, p. 183. Thallus 

 determinate or effuse, very thin or thin, continuous or here and 

 there rimulose, smooth, somewhat shining, sordid-lurid-glaucous 

 (K , CaCl ); hypothallus black, often indistinct. Apothecia 

 minute, concave, black, the thalline margin somewhat tumid, 

 prominent, entire or subcrenulate ; spores 0,015-24 mm. long, 

 0.009-14 mm. thick ; hymenial gelatine pale-bluish, then tawny 

 \vine-colouredwithiodine. Sagedia Icevata Ach. Lich. Univ. (1810) 

 t. 6. f. 5. 



Generally regarded as only a variety of L. gibbosa, but distinct in the 

 much thinner, more continuous thallus and the minute apothecia. More 

 definitely, however, it is separated from it, and from all the allied species, 

 by the form of the spermatia. These are slightly arcuate, 0,020-32 mm. 

 long, 0,0005 mm. thick (fide Nyl. Lich. Fret. Behring, p. 81). In the 

 single British specimen the thallus is indeterminate, but Acharius (Syn. 

 p. 134) says it is now and then limited by a black serpentine (hypo- 

 thalline) line. Both apothecia and spermogones are numerous, the 

 former being here and there somewhat crowded. 



Hob. On a damp quartzose riparian rock in a subalpine district. 

 Distr. Extremely local and scarce among the N. Grampians, Scotland. 

 B. M. : Glen Callater, Braemar, Aberdeenshire. 



172. L. calcarea Somm. Suppl. Fl. Lapp. (1826) p. 102; Nyl. 

 Flora, 1869, p. 409. Thallus determinate or subeffuse, tartareo- 

 farinose, continuous or rirnoso-areolate, white-cretaceous or greyish- 

 white (K , CaCl , medulla I ) ; hypothallus white. Apothecia 

 immersed, at length somewhat plane, submoderate, csesio-pruinose ; 

 the thalline margin entire or rugoso-plicate ; spores 2-6na3, rarely 

 8na3, ellipsoid or often subglobose, 0,018-30 mm. long, 0,014- 

 27 mm. thick; paraphyses not discrete, dark at the apices ; hyme- 

 nial gelatine bluish, then sordid-yellow with iodine. Cromb. Lich. 

 Brit. p. 54 ; Leight. Lich. Fl. 209, ed. 3, p. l92.Afpicilia cat- 



