burllia] lecideace^ 165 



(Grevillea xii. p. 58) to the variety (as f. alpina), is only a more 

 granulose state of the species. 



Hab. Incriisting mosses on rocks in an alpine situation. — B. M, 

 Near the snnmiit of Ben Lawers, Perthshire. 



Yar. arenicola A. L. Sm. — Thallus obsolete. Apothecia 

 minute, scattered, the margin slightly inllexed and shining, 

 otherwise as in the species. — Lecidea cilrinella var. arenicola 

 Nyl. ex Mudd Man. p. 187 (1861); Cromb. Lich. Brit. p. 94. 

 L. arenicola Leight. Lich. Fl. p. 356 ; ed. 3, p. 386. Baphiospora 

 arenicola Mudd Man. p. 186 (1861). 



Exsicc. Leight. n. 372. 



Differs from the species i]i being athalline and in the smaller, 

 solitary, though numerous apothecia. The asci, when immature, are 

 6-8-spored, or even 4-spored (Leight. II. c). 



Hah. On sandy soil and often parasitic on Baomyces rufus in 

 upland hilly districts. — Bistr. T'ound only in a few localities of Great 

 Britain and Ireland. — B. M. Goyt Lane, Baxton, Derbyshire ; Wapley 

 Hill, Herefordshire ; Stiperstones, Shropshire ; Loundsdale, Cleve- 

 land, Yorkshire ; Craig Calliach, Ben Lawers and Rannoch, Perth- 

 shire ; Countesswells Wood, near Aberdeen ; Mweelan, near Kylemore, 

 Connemara, Galway. 



76. BUELLIA De Not. in Giorn. Bot. Ital. ii. p. 195 (1846) 

 emend. ; Koerb. Syst. Lich. Germ. p. 223 (1855). — Biploicia 

 Massal. Rio. Lich. p. 86 (1852) ; Mudd Man. p. 168. Ahrothalhs 

 De Not. I c. p. 192 ; Mudd Man. p. 224. (PI. 13.) 



Thallus radiate-plicate {Biploicia), crustaceous or wanting 

 {Ahrothallus). Algal cells Frotococcus. Apothecia usually dark- 

 coloured and carbonaceous^ immarginate or with a proper margin 

 only ; asci usually 8-spored ; spores ellipsoid or oblong, usually 

 1 -septate, brown, sometimes with a hyaline epispore (halonate). 



Bi])loicia and AhrothaUus have been included in Buellia on 

 account of the similarity in the fruits. The species of Ahrothallus 

 are all parasitic on other Lichens, and have been described as fungi 

 by some authors. 



1. B. canescens De Not. in Giorn. Bot. Ital. ii. p. 197 

 (1846). — Thallus determinate, thickish, white or glaucous-white, 

 adnate, usually orbicular, radiate-plicate and lobate at the cir- 

 cumference, generally smooth, pruinose, sorediate towards the 

 centre (K + yellow, CaCl — ). Apothecia rather rare, black, 

 small, crowded towards the centre, adnate, plane and thinly 

 margined, becoming slightly convex and immarginate ; hypothe- 

 cium brownish-black ; paraphyses subdiscrete, thick, black at the 

 apices ; spores oblong-elliptical, obtuse at the ends, brown or 

 blackish- brown, 0,011-14 mm. long, 0,006-7 mm. thick ; hymenial 

 gelatine deep-blue with iodine. — Liclienoidcs crustosiim, orhiculare 

 incanum Dill. Hist. Muse. p. 135, t. 18, f. 17a (1741). Liidien 

 canescens Dicks. PI. Crypt, i. p. 10, t. 2, f . 5 (1785); With. Arr, 



