verrdoaria] veeeucakiace^ 291 



Thallus tartareous, thin; jjeritheda not forming pits in the rocks. 



34. V. Dufourii DO. Fl. Fr. ii. p. 318 (1805).— Thallus 

 whitish or brownish-grey, tartareous, thin, continuous, smooth, 

 determinate, sometimes with a black line at the edge. Perithecia 

 moderate in size, numerous, prominent, hemispherical, depressed 

 round the ostiole ; perithecial wall dimidiate ; spores ellipsoid, 

 0,015-22 mm. long, 0,006-010 mm. thick, or rather larger, hyme- 

 nial gelatine wine-red with iodine. — Leight. Angioc. Lich. p. 76 

 ife Lich. Fl. p. 415; ed. 3, p. 446; Mudd Man. p. 290; Cromb. 

 Lich. Brit. p. 113. V. concinna Borr. in Engl. Bot. Suppl. 

 t. 2623, f. 1 (1830) ; Tayl. in Mackay Fl. Hib. ii. p. 90 ; Hook, in 

 Sm. Eng]. Fl. v. p. 152 ; Leight. Angioc. Lich. p. 50, t. 22, fig. 3 

 & p. 76. 



Characterized by the almost Buperfloial umbilicate perithecia. 



Hab. On calcareous rocks. — Distr. Not common in Central and 

 N. England, N. Wales, Scotland and Ireland. — B. M. Cheddar Cliffs, 

 Somerset ; Minchinhampton, Gloucestershire ; Buxton, Derbyshire ; 

 Lamplugh, Cumberland ; I. of Lismore, Argyll ; Middleton, near 

 Cork; Dunkerron, Kerry ; Glenarm, Antrim. 



35. V. malhamensis Nyl. ex Shackleton & Hebden in 

 Naturalist, 1892, p. 17. — Thallus whitish-grey, thin, continuous. 

 Perithecia black, prominent, depressed round the ostiole ; spores 

 oblong, 0,014-16 mm. long, 0,005-6 mm. thick. Specimen not 

 seen. 



According to Nylander (Z. c.) similar in appearance to the preced- 

 ing with afBnities with Verrucaria pulicaris. 



Hob. Damp shady rocks near the ground (Malham, Yorkshire). 



36. v. prominula Nyl. ex Mudd Man. p. 291 (1861) emend.— 

 Thallus thin, greenish-white or brownish, tartareous, continuous, 

 wrinkled, effuse or determinate. Perithecia large, prominent, 

 scattered, subglobose or conical, black, depressed-umbilicate at 

 the apex ; perithecial wall entire ; spores broadly oblong or ellip- 

 soid, blunt at the ends, 0,018-20 mm. long, 0,007-010 mm. 

 thick. — Carroll, in Journ. Bot. iv. p. 25 (1866) ; Cromb. Lich. 

 Brit. p. 113 ; Leight. Lich. Fl. p. 419 ; ed. 3, p. 449. 



Hah. On maritime rocks. — Distr. Eare in S. England and in 

 S.W. Ireland. — B. M. Kerry ; Kilkee, Clare ; Derryolare, Connemara, 

 Galway ; Moher, Clare. 



Var. viridans Nyl. in Flora, Ixii. p. 224 (1879).— Thallus 

 and perithecia as in the species ; spores broadly oblong or almost 

 globose, much smaller, 0,010-12 mm. long, 0,007-9 mm. thick. — 

 Cromb. in Grevillea viii. p. 30. F. muralis Tayl. in Mackay Fl. 

 Hib. ii. p. 91 (1836) pro parte. 



Exsicc. Larb. Lich. Hb. (without a number). 



u 2 



