bilimbia] lecidbacb^ 147 



Bhexojohiale (Lich. Arot. p. 205 (I860)). Our specimens are 

 sparingly fertile ; the apotheoia are somewhat scattered or occasion- 

 ally approximate. 



Hah. On. decaying mosses among schistose rooks in an alpine 

 locality. — B. M. Summit of Ben Lawers, Perthshire. 



25. B. premneoides A. L. Sm. — Thallus effuse, thinly leprose, 

 pale- or greyish-greenish (K — , OaCl — ). Apothecia moderate, 

 plane, margined, black ; paraphyses slender ; epithecium at times 

 slightly greenish-suffused ; hypothecium black ; spores oblong, 

 obsoletely or thinly 3-septate, 0,019-25 mm. long, 0,007-8 mm. 

 thick ; hymenial gelatine wine-red with iodine. — Lecidea prem- 

 neoides Nyl. in Flora xlviii. p. 147 (1865) ; Leight. in Ann. Mag. 

 Nat. Hist. ser. 3, xvii. p. 62 (1866) & Lich. PL p. 333 ; ed. 3, 

 p. 350 ; Cromb. Lich. Brit. p. 79. Specimen not seen. 



Bab. On walls. — Distr. Very rare in the Channel Islands (Jersey). 



26. B. leucophsBOpsis A. L. Sm. — Thallus indeterminate, 

 squamulose, whitish, the squamules small, roundish, irregular, 

 adnate and depressed in the centre, scattered or contiguous 

 (K + yellow, OaCl — ). Apothecia moderate or somewhat large, 

 sessile, plane or subconvex, brownish-black, opaque, concolorous 

 within (dark-grey in the hymenial layer) ; hypothecium and 

 epithecium yellow- or dark -brown ; paraphyses very slender, 

 loosely coherent ; spores fusiform, 3-5-septate, 0,024-34 mm. 

 long, 0,005-8 mm. thick ; hymenial gelatine bluish, the asci at 

 length wine-reddish, with iodine. — Lecidea leucophseopsis Nyl. in 

 Flora Ivi. p. 20 (1873); Cromb. in Grevillea i. p. 141 ; Leight. 

 Lich. Fl. ed. 3, p. 364. 



Crombie states that the thallus of this species is not uncommon 

 on Ben Lawers, but it is very rarely seen in fruit. It is usually 

 associated with Sirosiphon saxicola. 



Sab. On quartzose stones. — B. if. On a wall, Ben Lawers (the only 

 locality). 



27. B. violac'ea Th. Fr. Lich. Scand. p. 372 (1874).— Thallus 

 very thin, subgranulose, greyish-white (K — , CaCl — ), often sub- 

 evanescent. Apothecia small, adnate, nearly plane or subconvex, 

 immarginate, pale-leaden-coloured ; hypothecium colourless ; para- 

 physes slender, concrete ; spores oblong, 3-septate, often slightly 

 curved, 0,014-17 mm. long, 0,005-7 mm. thick ; hymenial 

 gelatine bluish, the asci at length faintly wine-red, with iodine. 

 — Lecidea violacea Crouan ex Nyl. in Flora xly. p. 464 (1862) ; 

 Carroll in Journ. Bot. iii. p. 290 (1865) ; Cromb. Lich. Brit, 

 p. 71 ; Leight. Lich. Fl. p. 335 ; ed. 3, p. 355. Specimen not 

 seen. 



Resembles externally a biatorine form of Lecanora syringea. 

 Hab. On rocks in a maritime district. — Distr. Very local and 

 sparingly in N. Scotland (Lerwick, Shetland Islands). 



L 2 



