OF GREAT BRITAIN. 179 



26. L. nigro-glomerata, Leight. albido-glducescent, sub-areolate, 

 squamulose, squamules very small, confluent around the glomerations 

 of apothecia, otherwise dispersed, adnato-appressed, plano-convex or 

 depressed, smooth and shiuing, erenulate, (K yellow C yellow) ; 

 hypothallus black, appearing only on the margins of the squa- 

 mules ; apothecia black, large, numerously conglomerate,' deformed 

 by close proximity, shining, convex, internally colourless, margin 

 thickish, slightly paler, prominent, flexuose ; hypothecium colourless, ' 

 with only a small dusky-blackish lateral excipulum, which is often 

 continuous under the colourless hypothecium as a thin dusky line ; 

 paraphyses crowded, distinct ; spores 8, colourless, ellipsoid, simple, 

 moderate. 



On alpine quartzose rocks, rare. 1870. 



Geoo. Distbxb :— Europe. 



Bot. Pbov : — 15. 



Scotland :— Ben-y-Gloe, summit of Cairn Gowar. Rev. J. M. Crombie. (1870.) 



Approaching L. rusticula, Nyl. in generalhabit and appearance, but that it is a 

 much more minute lichen, with a granular thallus and fuscous hypothecium. 

 Externally with a general resemblance to L. diducens, Nyl., but distinct by the 

 character of the squamulose thallus, the colourless hypothecium, the larger 

 spores, and the apothecia being internally colourless. Gelatina hymenea I 

 blueish then dirty lutescent. Spores .0115 — .013 mm. long, .006—007 mm. 

 broad. 



27. L. circinata, (Pers.) cinerascent or cinerous-white, orbicular, 

 adnate, verrucoso-areolato-diffract in the centre, radioso-laciniate at 

 the circumference, lacinice narrow, plano-convex, contiguous, incised 

 and crenate at the apices, upper surface minutely albo-depresso- 

 granulate ; apothecia innate, sub-urceolate or plane, fuscous-black, 

 margin entire ; spores 8, colourless, ellipsoid, simple ; thallus K 

 yellow C yellow. 



On limestone rocks, rare. 1783. 



Syn:— Persoon in Ust. Ann. Bot. st. 7. p. 25. (1794.) Ach. Syn. 184. Nyl, 

 Scand. 152. MuddMan. 130. 



Fig :— E. Bot. 1941. Hepp Sporen t. 89 f . 777. Eelh. Fl. Cantab. 427. t. 6. 



Exs :— Nyl. 118. M. & N. 457. Zw. 189. Schaer. 328. Hepp 777. Anzi It. S. 

 163. Reich. & Schub. 75. 



Geog. Distrib : — Europe, Asia, Africa. 



Bot. Pkov:-4, 5.. .8.. .11, 12.. .15.. .31. 



England : — On Clare Hall Bridge, Cambridge ; Grantchester Churchyard 

 Wall. Rev. R. Relhan. (1783.) Kirkby Lonsdale, Westmoreland. Sir J. E. Smith. 

 Bury. Rev. G. R. Leathes. Hale End ! Malvern. Dr. Soil. Barnard Castle, 

 Durham. Rev. J. Sarrirnan. Canal Bridge near Congerstone, Leicestershire. 

 Reo. A. Bloxam. Pophills ; Oversley Bridge, Warwickshire. Mr. Pwrton. Per- 

 shore Bridge, Worcestershire. Mr. W. Joshua. 



Scotland : — Cathkin. Mr. Hophirk. Clova. Mr. Don. 



Channel Islands : — Guernsey. Rev. T. Sahoey. 



" Spores .0025 to .003 in. long, .00125 in. broad. Spermatia short, cylindrical, 

 straight." (Mudd.) "Spores .011—15 mm. long, .0065— .0085 mm. broad. 

 Paraphyses thick, generally distinctly articulate." (Nyl.) " Spores .011— 15 

 mm. long, .006—8 broad." (T. M. Fr.J 



28. L. frustuiosa, (Dicks.) albido-flavescent, thick, tartareous, 

 verrucoso-areolate or disperso-glebulose, glebulm sub-radiato-lobate, 

 smooth; apothecia numerous, sessile, fuscous-black, plane or sub- 

 convex, thalline margin thick, entire or sub-crenate ; spores 8, 

 colourless, oblongo-ellipsoid, simple ; thallus K yellow C yellow. 



On alpine rocks, rare. 1793. 



