324 PYRENOOARl'Kl [aRTUOPYKENIA 



somewhat furfuraceous. Perithecia very minute, black, semi- 

 immersed, the upper part ccmical, opening by a lathi^r wide ostiole ; 

 perithecial wall thin, entire ; paiaphysos numerous, shuider, 

 branched ; asci elongate, slightly narrowed at each end, about 

 0,140 mm. long, 0,025 nnn. thick ; spores usually 8 in the ascus, 

 elongate-clavate, the upper coll broader, sometimes with large 

 guttuhe, colourless, 1-septatc, large, 0,032-37 ram. long, 0,010 mm. 

 thick. 



The scanty algal symbiont is Trentepohlia, and has the deep 

 yellow colour of the gonidia of many of the maritime species. The 

 spores resemble somewhat those of A. epidermidis, but they are much 

 larger. The specimen was collected by J. A. Wheldon. 



Hah. On damp sandy shore. — B. M. Formby, Lancashire (the 

 only locality). 



18. A. bryospila A. L. Sm.— Thallus dark-brownish-black, 

 thin. Perithecia black, minute, prominent, subconical ; ostiole 

 poriform ; perithecial wall entire ; paraphyses distinct, slender, 

 branched ; asci oblong, slightly narrower upwards ; spores 

 usually 8 in the ascus, sometimes 4 or 2, colourless, 1 -septate, 

 0,027-44 mm. long, 0,008-012 mm. thick ; hymenial gelatine 

 not tinged with iodine. — Verrucaria bryospila Nyl. in Flora 

 xlvii. p.'357 (1864); Carroll in Journ. Bot. iii. p. 293 (1865); 

 Cromb. Lich. Brit. p. 120; Leight. Lich. Fl. p. 438; ed. 3, 

 p. 470. 



The British specimens are intermixed and somewhat over- grown 

 by Dermatocarpon cinereum. There are 8 spores in the ascus, some 

 of them of rather smaller size than those of the original Norwegian 

 plant. 



Hah. On mosses and schistose soil. — B. M. Ben Lawers, Perth- 

 shire (only British locality). 



Parasitic and doubtful species ; spores 1-septate. 



19. A. allogena A. L. Sm.^ — Thallus wanting. Perithecia 

 black, hemispherical ; perithecial wall dimidiate ; paraphyses 

 indistinct ; spores oblong or slightly clavate-oblong, colourless, 

 1-septate, one cell slightly thicker, 0,023-37 mm. long, 

 0,007-9 mm. thick. — Verrucaria allogena Nyl. in Flora xlviii. 

 p. 357 (1865) ; Leight. Lich. Fl. p. 461 ; ed. 3, p. 492. 

 V. epidermidis var. allogena Carroll in Journ. Bot. iv. p. 25 

 (1866) ; Cromb. Lich. Brit. p. 120. 



Eetained in this genus on account of the dimidiate apothecium, a 

 strongly lichenological character. The spores are very like those of 

 A. epidermidis, of which Nylander thought it might possibly be a 

 variety. 



Hab. Parasitic on the thallus of BJiizocarpon petrcetim var. 

 excentricum. — B, M, Ben Lawers, Perthshire (the only locality). 



