vrrrucaria] verrucariacb^ 295 



44. V. calciseda DC. Fl. Franc, ii. p. 317 (1805).— Thallus 

 effuse, thin, tartareous, subpulverulent, white or greyish-white, 

 often evanescent. Perithecia small, numerous, deeply immersed 

 in the thallus and the rock beneath, leaving pits in the stone, 

 the upper part more or less regularly divided by 4 or 5 fissures ; 

 perithecial wall dimidiate ; spores ellipsoid, 0,015-21 mm. long, 

 0,008-010 mm. thick.— Mudd Man. p. 292 ; Cromb. Lich. Brit, 

 p. 115; Leight. Lich. Fl. 427; ed. 3, p. 458 (excl. var. 

 purpurascens). V. immersa HotTm. PI. Lich. i. p. 58, t. 12, 

 figs. 2-4 (1790)? Tayl. Fl. Hib. ii. p. 90. 



Exsicc. Leight. n. 30 (as V. immersa). 



Distinguished by the fissured apex of the perithecia, on account 

 of which it has been placed by some authors in a separate genus, 

 Limhoria, 



Hah. On calcareous rocks. — Distr. Bather uncommon in S. and 

 N. England, rare in Scotland, S. and S.W. Ireland. — B. M. Torquay, 

 Devonshire ; Landslip, I. of Wight ; Laleston near Bridge-end, 

 Glamorganshire ; Great Orme's Head, Carnarvonshire ; Buxton, 

 Derbyshire ; Bilsdale, Yorkshire ; Morrone, Braemar ; near Cork ; 

 Dunkerron and Killarney, Kerry. 



Doubtful or parasitic species. 



45. V. Harrimani Ach. Lich. Univ. p. 284 (1810). —Thallus 

 effuse, tartareous, smooth, mouse-coloured, determinate. Perithecia 

 minute, black, immersed in the substratum, globose, dimidiate 

 depressed round the emerging ostiole ; spores ovate, very minute. — 

 Hook, in Sm. Engl. Fl. v. p. 153 ; Leight. Angioc. Lich. p. 63, 

 t. 19, fig. 4 ; Deakin in Ann. Mag. Nat. Hist. ser. 2, xiii. p. 38, 

 t. 3, fig. 9 (1854). Lichen Harrimani Sm. Engl. Bot. t. 2539 

 (1814). Lithocia Harrimani S. F. Gray Nat. Arr. i. p. 497 (1821). 

 Specimen not seen. 



A doubtful species. Considered by Hepp (Flecht. Eur. n. 691) to 

 be synonymous with V. hiascens, the spermogoniferous form of 

 V. Hochstetterif which has not been recorded for the British Isles, 

 though probably to be found. The minute spores indicate the 

 spermogonial character of the perithecia, though Deakin [1. c.) states 

 that asci are present. 



Hab. On hard gray calcareous rocks (Torquay, Devonshire ; 

 Durham). 



46. V. pulposa Leight. Lich. Fl. p. 427 (1871).— Thallus 

 chroolepoid or evanescent. Perithecia blackish, subglobose, 

 pulpose, polished, prominent ; epithecium indistinct ; perithecial 

 wall dimidiate blackish ; spores numerous, fuscous, oblong or 

 irregularly globose, simple ; paraphyses very short, crowded ; 

 hymenial gelatine untinged with iodine. — Leight. Lich. Fl. ed. 3, 

 p. 457. Specimen not seen. 



An abeirant and imperfectly described species. 

 Hab, On old rails near Shrewsbury, Shropshire. 



