392 LICHEXACEI. [lECAXOKA. 



B. Apotliecia biatorino-lecanorine : spores Snse, 1-septate, colourless ; 

 h^^nenial gelatine variously tinged Tvith iodine. Spermogones 

 with shortlj- jointed sterigmata and straight short spermatia. 



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

 Thallus determinate, squamulose, lurid-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 thalhis : spores sometimes Bnse, oblongo-fusiform, 0,014-18 mm. 

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

 and infuscate at the apices, hypothecium colourless ; hymenial 

 gelatine and especiallv the apices of the thecre bluish with iodine. 

 —Carroll, Journ. Bo't. 1866, p. 23 ; Cromb. Lich. Brit. p. 48 ; 

 Leight. Lich. Fl. p. 227, ed. 3, p. 217. — Psoroma hohph'ea ilont. in 

 Hist. Nat. Canar. (1840) p. 113. ThaUo'idima suhlurida (Nyl.), 

 Mudd, Man. p. 112.— Brit. Exs. : Leight. n. 380. 



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

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

 lecanorine. Its true place is also well indicated hy 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 thaUus is small, orbicular, and well fertile. 



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

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

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

 Guernsev. Pulborough, Sussex ; Bradstone churchyard and near Prawle 

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

 shire. Ar-dglass, co. Down ; Sybil Head, co. Kerry ; Coast of co. Clare. 



Yar. /3. glaucopsora Xyl. 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—1 mm. thick ; paraphyses slender, 

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

 Leight. Lich. Fl. p. 227, ed. 3, p. 21^.— Brit. Exs. : Larb. Caesar. 

 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 spermooones 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. : Grosuez Common, Island 

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

 Endellion and Penzance, Cornwall. 



