288 PYRENOCARPEl [VKRKUCARIA 



The thickish, sometimes orbicular thallus is limited and occasion- 

 ally intersected by the dark-coloured hypothallus. 



Hab. On calcareous rocks. — Distr. Uncommon in W. and N. 

 England, W. Scotland and in S. and W. Ireland. — B. M. Houghton, 

 Gloucestershire ; Ihixton, Derbyshire ; near Rievaulx and Newton 

 Wood, Cleveland, Yorkshire ; Craig Tulloch, Perthshire ; I. of Lismore, 

 Argyll ; Kenmare, Kerr^' ; Dromoland, Clare. 



27. V. murina Leight. Angioc. Lich. p. 44, t. 19, fig. 3 

 (1851). — Thallus mouse-grey or brownish, thin, effuse, continuous 

 and slightly pulverulent or occurring in spots and determinate. 

 Perithecia small, numerous, semi-immersed, prominent; perithecial 

 wall thickish, black, entire; spores ellipsoid, 0,018-24 mm. long, 

 0,006-12 mm. thick.— Mudd Man. p. 291 ; Cromb. Lich. Brit, 

 p. 115; Leight. Lich. Fl. p. 425; ed. 3, p. 455. V. myriocarpa 

 Hepp Flecht. Eur. n. 430 (1857) ; Leight. Lich. Fl. ed. 3, p. 456. 



Exsicc. Larb. Licli. Hb. n. 160 (as V. myriocarpa). 



Distinguished by the thin continuous thallus and numerous 

 almost superficial perithecia. Sometimes a black hypothallus forms 

 a line at the circumference. 



Hab. On rocks. — Distr. Rare in S. and N. England and in S. and 

 W. Ireland.— J5. M. Gloucestershke ; Hartlepool, Durham ; Cleghan, 

 Connemara, Galway. 



Var. pusilla Arn. in Flora xlvii. p. 599 (1864).— Thallus 

 bluish-giey, thin, somewhat pulverulent. Perithecia as in the 

 species ; spores smaller, 0,012-15 mm. long, 0,005-6 mm. thick.— 

 Verrucaria fugax Deakin in Ann. & Mag. Nat. Hist. ser. 2, xiii. 

 p. 35 (1854). 



Hab. On calcareous rocks. — Distr. Eare in S.W. England. — 

 B. M. Torquay, Devon. 



28. V. pinguicula Massal. in Lotos vi. p. 80 (1856) ; emend. 

 Koerb. Parerg. p. 379 (1863). — Thallus in determinate patches, 

 cartilaginous, continuous or finely cracked-areoJate, umber-brown, 

 limited by a dark line. Perithecia minute, hemispherical, 

 immersed, the apex only visible; spores ellipsoid, minute, 0,012 

 mm. long, 0,004 mm. thick. 



Described by Massalongo as having a deeply cracked thallus, 

 and redescribed as above by Koerber, who says {I. c.) that Massalongo's 

 description was incorrect. 



Hab. On calcareous rocks. — B. M. Bilsdale, Yorkshire. 



29. V. peloclita Nyl. in Flora, Ix. p. 461 (1877).— Thallus 

 grey or greyish-brown, thin, smooth, cracked-areolate, determinate. 

 Perithecia semi-immersed, becoming rather prominent ; perithecial 

 wall black, entire; spores oblong, rather small, 0,011-15 mm. 

 long, 0,005-6 mm. thick. — Cromb. in Grevillea vi. p. 114; 

 Leight. Lich. Fl. ed. 3, p. 452. 



