294 PYRENOCARPEI [VERRUCAttIA 



and in S. Ireland. — B. M. Downs, Sussex ; near Bisley, Sapperton 

 and St. Vincent Rocks, Bristol, Gloucestershire ; Llanyniynach, 

 Sliropshire ; Ayton, Cleveland, Yorkshire ; Craig Tulloch, Perthshire ; 

 I. of Lismore, Argyll ; near Cork ; Dunkerron, Kerry. 



41. V. dolomitica Massal. Gen. Lich. p. 22 (1854).— Thallus 

 tliiu, tartareous- farinose, continuous, greyish- or greenish-whito, 

 often with a tinge of rose-colour, usually limited by a dark line. 

 Perithecia semi-immei'sed in pits, the apex protruding, papillate 

 or truncate ; perithecial wall entire ; spores rather large, ellipsoid- 

 ovoid, 0,024-36 ram. long, 0,010-15 mm. thick. — AmjjJioridium 

 dolomiticum Massal. Symm. Lich. p. 80 (1855). 



Differs from V. Integra in the more developed limited thallus and 

 the deeper pits in which the perithecia are immersed. 



Hah. On calcareous and other rocks. — Distr. Rare in E. and 

 middle England, Central Scotland and S. Ireland. — B. M. Suffolk ; 

 Derbyshire ; near Bath ; Hartlepool, Durham ; near Edinburgh ; 

 Dunkerron, Kerry. 



42. V. marmorea A. Zahlbr. in Engler & Prantl Nat. 

 Pflanzenf. i. 1*, p. 55 (1903). — Thallus effuse, tartareous, 

 thinnish, continuous, smooth, pale-rose or rose-purple tinged with 

 red. Perithecia moderate in size, black, immersed, then slightly 

 emergent, leaving pits in the stone ; spores ovoid, 0,018 mm. long, 

 0,009 mm. thick. — V. purpurascens Hoffm. PI. Lich. i. p. 74, t. 15, 

 fig. 1 (1790). V. rupestris var. purpurascens Schser. Enura. 

 p. 217 (1850); Mudd Man. p. 292; Cromb. Lich. Brit. p. 114. 

 V. calciaeda var. purpurascens Leight. Lich. Fl. p. 428 ; ed. 3, 

 p. 458. Lichen marmoreus Scop. Carn. ed. 2, ii. p. 367 (1772) 

 (non With. & non Engl. Bot.). 



A doubtful British species. Two specimens have been recorded : 

 one collected by Mudd at Castle Eden, Durham, without spores, 

 with a cracked -areolate thallus and no sign of pitting, probably a 

 form of V. viridula ; the other corrected by Parfitt at Exeter I 

 have not seen. 



Hab. On calcareous rocks. — Distr. S.W. and N. England ? 



43. V. parva Deakin in Ann. Mag. Nat. Hist. ser. 2, xiii. 

 p. 33, t. 1, fig. 2 (1854). — ^Thallus somewhat tartareous, thin, 

 ashy-grey, continuous, effuse. Perithecia minute, globose, black, 

 semi-immersed and leaving shallow pits in the rock ; perithecial 

 wall entire ; paraphyses mucilaginous, disappearing ; asci oblong- 

 elliptical about 0,045 mm. long, 0,017 mm. thick; spores 8 in 

 the ascus, ellipsoid, blunt at the ends, colourless, small, 0,012-17 

 mm. long, 0,005-7 mm. thick. 



Deakin has described and figured the spores as 1 -septate, but an 

 examination of his specimen shows them to be simple with sometimes 

 disorganized contents that might simulate septation. 



Hah. On limestone rocks. — B, M. Torquay, Devonshire (the only 

 locality). 



