POLYBLASTIa] VERRUCARIACEiE 305 



13. P. scotinospora Hellb. in Vet. Akad. ¥6rh. 1865, p. 478. 

 — Thallus whitish or greyish-brown, warted-areolate, sometimes 

 almost obsolete. Perithecia rather large, sessile, prominent, 

 somewhat depressed round the ostiole ; perithecial wall incurved 

 at the base and almost entire ; paraphyses disappearing ; spores 8 

 in the ascus, ellipsoid, irregular, muriform, brown, 0,026-40 mm. 

 long, 0,013-21 mm. thick. — Verrucaria scotinospora Nyl. Lich. 

 Scand. p. 270 (1861); Cromb. Lich. Brit. p. 110; Leight. Lich. 

 Fl. p. 453 ; ed. 3, p. 485. Sphseromphale scotinospora Mudd Man. 

 p. 282 (1861). 



Hab. On schistose rocks. — Distr. Kara in alpine regions. — B. M. 

 Cwm Clwyd, Denbighshire ; Ben Lawers and Ben-y-Gloe, Blair Athole, 

 Perthshire ; Kylemore, Connemara, Galway. 



14. P.HenschelianaLomir. in Flora xli. p. 631 (1858).— Thallus 

 greyish or brownish, thin, cracked. Perithecia rather large, 

 subglobose or hemispherical, immersed in the thallus with a black 

 prominent ostiole ; perithecial wall black, almost dimidiate ; 

 paraphyses disappearing ; spores 8 in the ascus, broadly-oblong, 

 becoming dark-brown, muriform, large, 0,046-56 mm. long, 

 0,023-33 mm. thick ; hy menial gelatine wine-red with iodine. — 

 SphserompJiale Henscheliana Koerb. Syst. Lich. Germ. p. 336 

 (1855). Verrucaria suhambrina Nyl. Lich. Scand. p. 269 (1861) 

 (tide Th. Fr. in K. Svensk. Vetensk. Soc. Nov. Act. 1877, 8, p. 12) ; 

 Carroll in Journ. Bot. iii. p. 292 (1865) ; Cromb. Lich. Brit, 

 p. 109 ; Leight. Lich. Fl. p. 458 ; ed. 3, p. 485. V. Henscheliana 

 Cromb. in Journ. Bot. ix. p. 179 (1871); Leight. Lich. Fl. 

 p. 457 ; ed. 3, p. 489. 



Exsicc. Larb. Lich. Hb. n. 198. 



Hab. On schistose rocks. — Distr. Rare in mountainous districts of 

 N. Scotland and W. Ireland. — B. M. Ben Lawers, Perthshire ; Lough 

 Feagh, Connemara, Galway. 



15. P. nigritella A. L. Sm. — Thallus black, etiuse. Perithecia 

 small, black, semi-immersed, somewhat prominent, the ostiole 

 minute ; perithecial wall entire ; paraphyses mucilaginous, dis- 

 appearing ; asci elongate-clavate ; spores 8 in the ascus, irregularly 

 ellipsoid, dark-brown, variously muriform with few irregular 

 cells, small, 0,21-36 mm. long, 0,09-14 mm. thick (usually 

 0,020-22 mm. long, 0,010-12 mm. thick); hymenial gelatine 

 wine-red or tawny-yellowish with iodine. — Verrucaria nigritella 

 Nyl. in Flora xlviii. p. 357 (1865) ; Carroll in Journ. Bot. iv. 

 p. 25 (1866) ; Cromb. Lich. Brit. p. 110 ; Leight. Lich. Fl. p. 466 ; 

 ed. 3, p. 497. 



Judging from the description similar to if not identical with 

 P. gothica (Th. Fr. Bot. Not. 1865, p. 112), which differs somewhat 

 in having more inflated asci and slightly narrower spores. Leighton 

 quotes Parmelia scruposa var. bryophila, pro parte (Angioc. Lich. t. 

 11, f. 3b) as representing the spores of this species. 



II. X 



