392 LICHEN A CEI. [LECAXOEA. 



B. Apothecia biatorino-lecanorine ; spores 8nae, 1-septate, colourless; 

 hymenial gelatine variously tinged with iodine. Spermogones 

 with shortly jointed sterigmata and straight short spermatia. 



56. L. holophaea Nyl. Bull. Soc. Bot. t. viii. (1861) p. 755. 

 Thallus determinate, squamulose, Inrid-brown or cervine-chestnut ; 

 squamules firm, difform, subcontiguous or somewhat imbricate, 

 repand or obtusely crenate at the margins (K ,CaCl ). Apo- 

 thecia small, adnate, at first plane, with entire thalline margin, 

 at length convex and biatoroid, dark-brown or concolorous with 

 the thallus : spores sometimes 6nae, oblongo-fusiform, 0,014-18 mm. 

 long, 0,004-5 mm. thick ; paraphyses moderate, slightly incrassate 

 and infuscate at the apices, hypothecium colourless ; hymenial 

 gelatine and especially the apices of the thecse bluish with iodine. 

 Carroll, Journ. Bot. 1866, p. 23 ; Cromb. Lich. Brit. p. 48 ; 

 Leight. Lich. Fl. p. 227, ed. 3, p. 217. Psoroma holoph^a Mont, in 

 Hist. Nat. Canar. (1840) p. 113. TJialloidima sublurida (Nyl.), 

 Mudd, Man. p. 172. Brit. Exs. : Leight. n. 380. 



Might readily be taken for a Lecidea allied to L. lurida, were it not 

 that the young apothecia, seldom present in our specimens, are distinctly 

 lecanorine. Its true place is also well indicated by the character of the 

 spermogones, which are not unfrequent. Our Herbaria specimens, owing 

 to the fragile nature of the habitat, are chiefly fragmentary, but in the 

 few which are perfect the thallus is small, orbicular, and well fertile. 



Hab. On the ground in crevices of rocks and walls in maritime, very 

 rarely upland districts. Distr. Local in the Channel Islands, S. and W. 

 England, S. and N.E. Ireland. B. M. : Moulin Huet Bay, Island of 

 Guernsey. Pulborough, Sussex ; Bradstone churchyard and near Prawle 

 Point, S. Devon; near Penzance, Cornwall; near Bridgenorth, Shrop- 

 shire. Ardglass, co. Down ; Sybil Head, co. Kerry ; Coast of co. Clare. 



Var. ft. glaucopsora Nyl. Flora, 1868, p. 164 ; cfr. p. 473. 

 Thallus subeffuse, squamuloso-crenate, granuloso-squamulose or 

 subleprose, glaucous- or greyish-white (K , CaCl ). Apothecia 

 moderate, livid-brown, the thalline margin subentire ; spores fusi- 

 form, 0,012-18 mm. long, 0,003-4 mm. thick ; paraphyses slender, 

 clavate and brownish at the apices. Cromb. Lich. Brit. p. 48 ; 

 Leight. Lich. Fl. p. 227, ed. 3, p. 218. Brit. Exs. : Larb. Oesar. 

 n. 79. 



Only a well-marked variety, though differing from the type in colour, 

 the less developed thallus, and some other minor characters. It is rather 

 variable in texture, becoming at length almost entirely leprose, the squa- 

 mules being only here and there visible. The thalline margin of the 

 rather scattered apothecia is persistent. The spermogones are not un- 

 frequent with spermatia 0,003 mm. long, 0,001 mm. thick. 



Hab. On rocks in maritime districts. Distr. Only sparingly in the 

 Channel Islands and S.W. England. B. M. : Groanez Common, Island 

 of Jersey; Saint's Bay, Island of Guernsey; Island of Aldemey. Near 

 Endellion and Penzance, Cornwall. 



