338 PTEENOCAEPEI [PORINA 



12. P. leptospora A. L. Sm. — ThaJlus very thin, brown. 

 Perithecia minute, black, hemispherical, the base immersed ; the 

 ostiole a minute papilla ; perithecial wall entire, or thin under 

 the base; paraphyses scanty, distinct; asci cylindrical, slightly 

 narrower upwards, about 0,090 mm. long, 0,010-12 mm. thick ; 

 spores 8 in the ascus, colourless, elimgate-fusiform, 8- or more- 

 septate, 0,045-55 mm. long, 0,003-4 mm. thick. — Verrucaria 

 leptonpora Nyl. in Flora xlvii. p. 487 (186-t) & li. p. 164 (1868) ; 

 CarroU in Journ. Bot. vi. p. 101 (1868) ; Cromb. Lich. Brit, 

 p. 117 ; Leight. Lich. Fl. p. 452 ; ed. 3, p. 484. 



Outwardly very similar to P. olivacea, but differing in the 

 character of the spores. 



Sab. On bark of hoDy. — B. M. Dinish, Killamey, Kerry. 



13. P. furvescens A. L. Sm. — ^Thallus brown or olivaceoiis- 

 brown, granulate, imequal, thin, effuse not continuous. Perithecia 

 black, moderate in size, innate, the conical ostiole projecting ; 

 perithecial wall entire ; paraphyses slender, crowded ; spores 8 

 in the ascus, colourless, fusiform, 3— 5-septate, 0,031—33 mm. long, 

 0,006 mm. thick. — Verrucaria furvescens Nyl. in Flora xlvii. 

 p. 356 (1864); Carroll in Journ. Bot. iii. p. 293 (1865); Cromb. 

 Lich. Brit. p. 117 ; Leight. Lich. Fl. p. 450; ed. 3, p. 481. 



Considered by Nylander to be nearly allied to P. cldorotica. The 

 single specimen in the herbarium is too meagre for examination ; 

 CarroU {J,, c.) states that in the specimens examined by him the spores 

 are only 3-septate. 



Bab. On the ground on mosses. — B. M. Summit of Ben Lasers, 

 Perthshire (the only locality). 



14. P. insiliens A. L. Sm.— Thallus dirty-brownish-white, 

 thickish, tartareous, deeply cracked, subfurfuraceous. Perithecia 

 large, imbedded in rather large hemispherical thalline tubercles, 

 the ostiole papillate, emerging ; perithecial wall blackish-brown, 

 dimidiate, the inner wall pale-brown; paraphyses slender, distinct ; 

 spores 8 in the ascus, broadly fusiform, obtuse at the apices, 

 5-7-septate, 0,050-67 mm. long, 0,011-14 mm. thick; hymenial 

 gelatine colourless with iodine. — Verrucaria insiliens Larb. ex 

 Nyl. in Flora Ix. p. 566 (1877); Cromb. in Grevillea vi. p. 114 ; 

 Leight. Lich. Fl. ed. 3, p. 484. Specimen not seen. 



Hab. ]n deep recesses of caves, Twelve Pins, Connemara, Galway 

 (the only locality). 



15. P. Curnowii A. L. Sm. in Journ. Bot. xlix. p. 44, 

 t. 510, f. 9 (1911). — Thallus oKvaceous-brown, tartareous, 

 thin, unequal, continuous or cracked. Perithecia scattered, 

 black, small, hemispherical, immersed at the base, the ostiole a 

 minute papilla, scarcely visible ; perithecial wall dimidiate ; para- 

 physes numerous, slender ; asci cylindrical-clavate, 0,080 mm. 

 long, 0,007-S mm. thick ; spores 8 in the ascus, narrowly fusi- 

 form, 7- or more- septate, about 0,052 mm. long, 0,003 mm. thick. 



