ACROCORDIA] PYRBNDLACEffi 315 



sometimes obsolete. Peritliecia dull-brownish-black, sometimes 

 partly pruinose, rather large but mixed with smaller, conical or 

 hemispherical, slightly immersed, spreading at the base, the 

 ostiole papillate, shining ; perithecial wall dimidiate ; paraphyses 

 numerous, slender ; asci cylindrical ; spores oblong or broadly 

 ellipsoid, 1-septate, 0,015-23 mm. long, 0,007-9 mm. thick. — 

 Verruearia epipolsea Borr. in Engl. Bot. Suppl. t. 2647, fig. 3 

 (1830) (non Ach.) ; Hook, in Sm. Engl. Fl. v. p. 154 ; Tayl. in 

 Mackay PI. Hib. ii. p. 92 ; Leight. Angioc. Lich. p. 61, t. 26, 

 fig. 2. r. conoidea Fr. Lich. Eur. p. 432 (1831); Cromb. Lich. 

 Brit. p. 118 ; Leight. Lich. Fl. p. 430 ; ed. 3, p. 460. Thelidium 

 conoideum Mudd Man. p. 296 (1861). 



Exsicc. Leight. n. 31 ; Mudd n. 286 ; Larb. Lich. Hb. n. 118. 



Hab. On calcareous rocks. — Distr. Frequent throughout England, 

 Wales and Ireland, rare in Scotland. — B. M. Shanklin, I. of Wight ; 

 Torquay, Devon; Hyde, Gloucestershire; Leigh Woods, Clifton, 

 Somerset ; Llanymynech and Llanorda, Oswestry, Shropshire ; Bedd- 

 gelert, Merioneth ; Great Orme's Head, Carnarvonshire ; Youlgreave, 

 Derbyshire ; Ingleby, Cleveland, Yorkshire ; near Cork ; Derryquin, 

 Kerry ; Ballinakill, Connemara, Galway. 



4. A. Salweii A. L. Sm. — Thallus white or greyish, thin, tar- 

 tareous, powdery or nearly obsolete. Perithecia black, rather large, 

 prominent almost globose, slightly immersed or almost entirely 

 sessile, somewhat wrinkled, the ostiole poriform ; perithecial 

 wall thick, black, entire ; paraphyses numerous, slender, distinct ; 

 asci cylindrical ; spores oblong or broadly ellipsoid, 1-septate, 

 0,021-23 mm. long, 0,008-011 mm. thick. Verruearia gemmata 

 subsp. Salweii Leight. ex Nyl. in Act. Soc. Linn. Bord. ser. 3, 

 i. p. 435 (1856). V. Salweii Leight. ex Cromb. Lich. Brit. p. 118 

 (1870) ; Leight. Lich. Fl. p. 439 ; ed. 3, p. 469. Thelidium 

 Salweii Mudd Man. p. 296 (1861). 



Closely allied to the preceding, but differing in the entire perithecial 

 wall and the non-papillate ostiole. 



Sab. On calcareous or arenaceous rocks and mortar of walls. — 

 Distr. Bare in S. and W. England and in S. and W. Ireland.^ 

 B. M. Near Hurstpierpoint, Sheffield Park and Danny, Sussex ; 

 Oswestry, Shropshire ; Ingleby, Cleveland, Yorkshire ; Glanmire, 

 Cork. 



113. ARTHOPYRENIA Massal. Ric. Lich. p. 165 (1852) & 

 emend. Gen. Lich. p. 16 (1854) ; Mull.-Arg. in Engl. Bot. Jahrb. 

 vi. p. 376 (1885) (excl. Acroeordia). Lejophlea S. F. Gray Nat. 

 Arr. i. p. 495 (1821) pro parte. Verruearia subg. Lejophlea 

 Ach. Lich. Univ. p. 274 (1810) pro parte. (PI. 49.) 



Thallus crustaceous, superficial or developed within the 

 substratum. Perithecia simple, always dark-coloured, superficial 

 or semi-immersed, globose or semi-globose ; paraphyses persistent, 

 branched and entangled, or sometimes mucilaginous and dis- 



