238 GKAPHIDBI [OPEGKAPHA 



0,016-24 mm. long, 0,004-6 mm. thick.— Cromb. Lich. Brit, 

 p. 99 ; Leight. Lich. Fl. p. 378; ed. 3, p. 401. 



Exsicc. Cromb. n. 195. 



Differs from the preceding in the almost constant absence of 

 thallus, the more lax character of the paraphyses and the thinner 

 walled asci at the tips. 



Hah. On rocks. — Distr. Eather rare throughout the British Isles. 

 — B. M. I. of Wight ; near Ckencester, Gloucestershire ; Aherdovey, 

 Merioneth ; Ayton, Cleveland, Yorkshire ; Achosragan, Appin, Argyll ; 

 Craig TuUooh, Blair Athole, Perthshire ; Dinish Island, KUlamey, 

 Kerry ; Lettermore, Connemara, Galway. 



13. 0. xanthodes NyJ. in Flora Ixi. p. 245 (1878).— Thallus 

 yellow or yellowish-grey, thin rather smooth, cracked into minute 

 areolse. Apothecia minute, oblong, black with a narro w disc ; 

 hypothecium black ; paraphyses conglutinate ; .spores fusiform- 

 oblong, 3- sometimes 4-septate, colourless, 0,015-18 mm. long, 

 0,005-6 mm. thick ; hymenial gelatine wine-red with iodine ; 

 spermatia straight, 0,004 mm. long, 0,001 mm. thick. — Cromb. 

 in Grevillea vii. p. 97 ; Leight. Lich. Fl. ed. 3, p. 404. 



Well characterized by the areolate thallus and the minute scattered 

 apothecia. 



Hah. On rocks. — B. M. Kylemore, Connemara, Galway (the only 

 locality). 



14. 0. mirifica Stirton in Scott. Nat. 1879, p. 17.— Thallus 

 whitish or greyish, thickish, minutely cracked, sometimes nearly 

 granulose, sometimes farinaceous (K — , K.CaOl. + red). Apo- 

 thecia black, moderate in size, sessile, round or oblong, scattered 

 or aggregate ; disc pruinose or naked, at first somewhat concave 

 and then acutely margined, at length plane, often somewhat 

 convex and immarginate ; hypothecium black or fuscous-black, 

 thick ; paraphyses irregular, indistinct, apices clavate, nigricant ; 

 spores 8, colourless, oblong or obtusely fusiform, 3-septate, 0,014- 

 21 mm. long, 0,0035—45 mm. thick; hymenial gelatine wine-red 

 with iodine. — Leight. Lich. Fl. ed. 3, p. 545. Specimen not seen. 



Perhaps more nearly allied to Lecanactis than to Opegraplia. 

 Hob. On rocks, I. of Cumbrae. 



Spores b—l -septate. 



15. 0. paraxanthodes Nyl. in Flora Ixii. p. 357 (1879). — 

 Thallus pale-yellow or pale-greenish, thin, minutely cracked- 

 areolate. Apothecia minute, oblong or linear-oblong, disc slit- 

 like ; spores fusiform-oblong, 5- (sometimes 4-) septate, 0,023-25 

 mm. long, 0,008-9 mm. thick ; hymenial gelatine tawny-wine- 

 reddish with iodine ; spermatia straight, 0,005-7 mm. long, 

 0,0006 mm. thick. — Cromb. in Grevillea viii. p. 113 (1880). 



Exsicc. Larb. Lich. Hb. without number. 

 Similar to 0. xanthodes, but distinguished by the larger spores. 

 Hah. On shady calcareous rooks. — B. M. Aohnanure, Galwaj- 

 (the only locality). 



