LECANOKA.] I.KCANO-LECIDEEI. 473 



Lawer.s, Pcrllisliire : near I'ortlutlien, Kiucanliiicshire ; Morronc, ]}raoiuar, 

 AbeicletMisliire. Kilciilly, near Cork; Kilkoe, co. Clare; Doujrliruag:h 

 aud Maam nits., Cuniieinara, co. Gahvay ; lilack mt., cu. Antrim. 



Form obscurata Xyl. Tlora, 1872, p. 3G4. — Thallus dark- or 

 olive-greyish. Apothecia and spermogones as in the type. — Lcight. 

 Lich. El. ed. 3, p. 1U5. — Parmdia ciaerea 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 iu the darker thallus, it entirely agrees. In this 

 respect, however, transition states at times occur. 



Huh. On rocks and boulders in upland and subalpine tracts. — Distr. 

 Found onl}' in a lew localities in Great Britain and S.W. Ireland. — 

 13. M. : Malvern Hills, Worcestershire ; Caer Caradoc, Shropshire ; Cliff- 

 rigg, Cle\ eland, Yorkshire ; Restou Scar, Staveley, Westmoreland. 

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

 rone, Braemar, Aberdeenshire. Killarne}', co. Kerry. 



171. L. laevata Xyl. Flora, 1872, p. 3G4, 1881, p. 183.— Thallus 

 deterniiuate or effuse, very thin or thin, coutinuous 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 

 wine-coloured with iodine. — iSa^edia hvvata Ach. Lich. Univ. (ISIO) 

 t. 6. f. 5. 



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

 much thinner, more continuous thallus aud 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, 0,000o mm. thick (fide Kyi. Lich. Fret. Behi-ing, p. 31). In the 

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

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

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

 former being here aud there somewhat crowded. 



Hah. 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; Xyl. 

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

 fariuose, continuous or rimoso-areolate, white-cretaceous or greyish- 

 white (K—,CaCl—, medulla I—) ; hj-pothallus white. Apothecia 

 immersed, at length somewhat plane, submoderate, ca?sio-pruinose ; 

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

 8n3e, 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. i^2. —AsjjiciUa cal- 



