ARTHOPYRENIA] PYRENULACBiE 321 



semi-immersed and slightly spreading at the base, or small, 

 emergent and subglobose ; peritliecial wall dimidiate ; paraphyses 

 numerous, septate, lax or coherent ; asci elongate-clavate ; spores 

 elongate, fusiform-clavate, 1 -septate, the cells with several guttulte 

 and spuriously 3-5-septate, colourless or slightly tinged yellowish, 

 0,023-35 ram. long, 0,006-7 mm. thick. — Verrucaria analeptoides 

 Nyl. in Flora 1. p. 180 (1867) (non Bagl. & Carest.). F. analep- 

 tiza Nyl. in op. cit. Ivi. p. 300 (1873) ; Leight. Lich. Fl. ed. 3, 

 p. 464. V. antecellens var. analeptoides Cromb. Lich. Brit, 

 p. 119 (1870); Leight. Lich. Fl. p. 435. F. elongatula Nyl. in 

 Flora li. p. 164 (1868). F. punctiformis f. elongatula Leight. Lich. 

 Fl. p. 434 ; ed. 3, p. 466 ; Cromb. Lich. Brit. p. 120. 



Not to be confused with A. suhmicans, the spores of which are 

 4-guttulate but finallj'^ S-septate. It differs from A. stigmatella, with 

 which it has been associated, in the grej^er more superficial thallus 

 and in the narrower guttulate spores. Nylander gives the size of the 

 spores at 0,036-50 mm. long, 0,007-010 mm. thick, but these measure- 

 ments are not borne out by an examination of Carroll's specimen. 



Hab. On bark of trees. — Distr. Rare in S.W. Ireland. — B. M. 

 Dinish and Tore Mt., Killarne}^, Kerry ; Loughcooter, Galway. 



9. A byssacea A. L. Sm. — Thallus filmy, whitish, thin, effuse. 

 Perithecia minute, black, globose, semi-immersed ; perithecial 

 wall dimidiate ; paraphyses numerous, branched, free ; asci 

 elongate-clavate, about 0,070 mm. long, 0,017 mm. thick ; spores 

 8 in the ascus, fusiform, 1 -septate (?), colourless, 0,015 mm. long, 

 0,004 mm. thick. — Verrucaria byssacea Tayl. in Mackay Fl. Hib. 

 ii. p. 89 (1836) (non Ach. fide Leight. Angioc. Lich. p. 38). 



Leighton suggests (?. c) that Taylor's species is identical with 

 Aci'ocordia biformis, but the minute perithecia and the structure of 

 asci and spores are entirely distinct. There is only one small specimen 

 in the herbarium of the British Museum collected by Dr. Taylor ; the 

 spores are somewhat imperfectly developed, but so far as can be 

 determined they are 1 -septate. 



Hah. On barks of trees, oak and elm. — B. M. Presumably Kerry. 

 (Ex Herb. Salwey.) 



Growing on trees ; thallus dark-coloured ; spores 1-septate. 



10. A. Laburni Sydow Flecht. Deutschl. p. 295 (1887).— 

 Thallus thin, smooth, brown or brownish-black, forming dark 

 spots on the bark. Perithecia minute, hemispherical, semi- 

 immersed, black and shining ; perithecial wall dimidiate ; para- 

 physes indistinct, disappearing ; asci rather swollen, narrower 

 upwards; spores oblong-linear, 1-septate, scarcely constricted, the 

 cells almost equal, sometimes with two or more guttulse ; 0,020-25 

 mm. long, 0,004-5 mm. thick ; hymenial gelatine yellow with 

 iodine.—^. Fumago Mudd Man. p. 302 (1861) (non Koerb. Syst. 



II. Y 



