46 LECANO-LECIDEEI [lECIDEA 



predominating hypothallus. Apotliecia scattered, sessile on the 

 hypotliallus, round or angular-difrorni, concave with a thick, 

 black, prominent, entire or liexuose margin, the disc of a pale 

 grey colour ; hypothecium blackish-brown ; paraphyses thick, 

 brown at the apices ; spores linear-oblong, minute, 0,007-3 mm. 

 long, 0,003 mm. thick. Leight. Lich. Fl. ed. 3, p. 276. 



Hab. On rocks. — B. M. Doughruagh Mt., Connemara, Galway (the 

 only locality). 



66. L. tenera Nyl. in Flora lii. p. 83 (1869).— Thallus effuse, 

 thin, unequal or subgranulate, rimulose, greyish-green (K -f 

 yellow, CaCl — ). Apothecia minute, plane, thinly margined, 

 pale, the margin paler, nearly whitish, at length obliterated ; 

 paraphyses scanty, moderate, incrassate or clavate at the apices ; 

 epithecium and hypothecium colourless ; spores oblong or sub- 

 bacillar, simple or obsoletely 1 -septate, 0^008-10 mm. long, 

 0,0015-25 mm. thick ; hymenial gelatine bluish with iodine. — 

 Cromb. in Journ. Bot. vii. p. 232 (1869) & Lich. Brit. p. 70 ; 

 Leight. Lich. Fl. p. 259. Lecanora tenera Cromb. in Grevillea iii. 

 p. 82 (1874) ; Leight. Lich. Fl. ed. 3, p. 188. 



Exsicc. Cromb. n. 68 ; Larb. Lich. Hb. nos. 18, 93. 



Kesembles Lecanora in the pseudo-lecanoroid (egonidial) margin 

 of the apothecia. The thallus spreads very extensively over the 

 substratum, but is rarely well fertile, the apothecia being generally 

 much scattered. Occasionally the thalline granules are depressed and 

 more or less dispersed (form explanatula Nyl. fide Leight. Lich. 

 Fl. ed. 3, I. c), but this is seen in otherwise typical specimens. 

 The spermogones are frequent, colom'less, with spermatia oblong, 

 0-004-5 mm. long, 0,0015 mm. thick. 



Hah. On shady rocks, granitic and quartzose, in maritime tracts. 

 — Distr. Found only in the Channel Islands, N.E. Scotland, and 

 N.W. Ireland. — B. M. La Moye and Boulay Bay, Jersey ; near Bay of 

 Nigg, Kincardineshire ; Letterbeg, Connemara, Galway. 



67. L. antrophila Larb. ex Leight. in Trans. Linn. Soc. ser. 2, 

 i. p. 242, t. xxxiii. figs. 10 & 11 (1878).— Thallus yellowish-green, 

 thin, effuse^ pulverulent-furfuraceous (K — , CaCl — ). Apothecia 

 yellowish-red, small, scattered, sessile, excessively convex and 

 prominent, with only a pale narrow margin when wetted ; 

 hypothecium thick, dark yellowish-red ; paraphyses indistinct, 

 colourless ; spores linear or linear-oblong, minute, 0,009 mm. 

 long, 0,0025 mm. thick ; hymenial gelatine pale-blue with 

 iodine. — Leight. Lich. Fl. ed. 3, p. 252. 



Hah. On the interior of caves. — B. M. Mwellan near Kylemore, 

 Galway (the only locality). 



68. L. picila Leight. Lich. FL, ed. 3, p. 251 (1879).— 

 Thallus dirty yellowish-white, thin, effuse, furfuraceous. Apo- 

 thecia black, sessile, plane or hemispherical, confluent, marginate, 



