236 ORAPIIIDKI [OI'KGUAPUA 



Var. hysteriiformis Cromb. in Journ. Bot. xx. p. 276 (1882). — 

 Thallus greyish, thin or obsolete. Apothecia larger and more 

 prominent than in the species, and the margins sometimes 

 furrowed; spores colourless, 3-5-septate, 0,015-16 mm. long, 

 0,003r)-10 mm. thick.— O. hjderriformis Nyl. in Flora Ixii. p. 224 

 (1879); Cromb. in Grevillea viii. p. 30 (1879). 



Hah. On rocks by the sea. — B.M. Kylemore, Connemara, Galway 

 (the onl}' locality). 



9. 0. ^rumuiosa Duf. in Journ. Phys. Ixxxvii. p. 214 (1818). — 

 Thallus white, thick, farinaceous (Kf + yellow, CaCl -f- red). 

 Apothecia black, at first immersed then sessile, ellipsoid, 

 roundish, elongate or angular ; disc bluish-pruinose ; margins 

 thin, prominent, persistent ; hypothecium thick, black ; para- 

 physes thickish, shortly branched above and somewhat con- 

 glutinate ; spores colourless, oblong-fusiform, 3-septate, 0,015- 

 17 mm. long, 0,003-4 mm. thick. — Lei^ht. Lich. Fl. p. 380; 

 ed. 3, p. 403 & in Grevillea ii. p. 171, t. 26, f. 2 (1874). 



Apt to be confused with Lecanactis Dilleniana, but with a much 

 thicker thallus, and more graphideine apothecia. 



Hah. On rocks. — Distr. Rare in the Channel Islands and S. 

 England. — B. M. Near Eozel, Jersey ; Walls of Old Nunnery, Alder- 

 ney ; Lynmouth, Devon ; I. of Portland, Dorset. 



10. 0. nothiza Nyl. in Flora Ixxx. p. 13 (1880).— Thallus 

 greyish, thin and firm, cracked into small areolae on a blackish 

 almost obsolete hypothallus. Apothecia black, oblong, roundish 

 or angular ; disc plane, usually bluish-pruinose ; margins thin, 

 prominent, disappearing ; hypothecium thick, brownish-black ; 

 paraphyses thickish, shortly branched above and somewhat 

 conglutinate ; spores oblong, 3-septate, colourless, 0,015-17 mm. 

 long, 0,003-4 mm. thick. — Cromb. in Grevillea viii. p. 113 & in 

 Journ. Bot. xx. p. 276 (1882). 0. varia f. notha (saxicolous). 

 Leight. Lich. Fl. p. 381 ; ed. 3, p. 404 (fide Larb. exsicc. n. 317). 



Exsicc. Larb. Lich. Hb. n. 317; Lich. Caesar, n. 91. 



Perhaps only a growth form of the preceding which it strongly 

 Tesembles, differing chiefly in the thin grey areolate thallus and the 

 less distinctly pruinose apothecia. 



Hah. On rocks. — Distr. Rare in the Channel Islands. — B. M. 

 La Coupe, East Coast, Jersey ; Moulin E[uet Ba^' , Sark. 



11. 0. calcarea Turn, in Sm. Engl. Bot. t. 1790 (1807); 

 Ach. Lich. Univ. p. 250 (1810). — Thallus white or yellowish, 

 tartareous, sometimes very thin and pulverulent. Apothecia 

 linear-elongate, black, simple, curved, flexuose and wavy, usually 

 conglomerate in small crowded masses, sometimes scattered, 

 shining ; disc slit-like, rather open ; pa.raphyses crowded, slender, 

 subdiscrete : asci broadly clavate with a thick wall at the tip ; 



