lopadidm] lrcidbacb^ 199 



80. LOPADIUM Koerb. Syst. Lich. Germ. p. 210 (1855). 

 (PI. 17.) F ^ ; 



Thallus crustaceous. Algal cells Protococcus. Apothecia 

 light- or dark-coloured with a proper margin only ; ascus 

 normally 1-spored sometimes 4-8-spored ; spore large, colourless 

 or brownish, without a mucilaginous epispore (not halonate), 

 muriform. Spermogones with septate sterigmata and short 

 straight ovate or ellipsoid spermatia. 



1. L. pezizoideum Koerb. I. c. — ThaUus effuse, thinnish, 

 granulosa- or subsquamulose-concrescent, dark-grey or brownish 

 (K — , CaCl— ). Apothecia elevated, moderate, somewhat con- 

 cave, brownish-black, white within under the epithecium, the 

 margin thin, entire, inflexed, paler ; hypothecium brownish- 

 black ; paraphyses thickish, concrete, black at the apices ; spores 

 solitary, ellipsoid, brownish, large, 0,065-110 mm. long, 0,030-46 

 mm. thick ; hy menial gelatine not tinged, but the asci reddish- 

 wine-coloured with iodine. — Mudd Man. p. 190. Lecidea pezi- 

 zoidea Ach. Lich. Univ. p. 182 (1810); Cromb. Lich. Brit, 

 p. 75 ; Leight. Lich. Fl. p. 348 ; ed. 3, p. 375. 



A rather variable plant as to the character of the thallus and the 

 size of the apothecia in countries where it is more common than in 

 Great Britain. Our specimens, which are only muscicolous, 

 represent the type as described by Acharius. In these, which are 

 well fertile, the thallus, when wet, is more or less brownish-green. 



Hab. Incrusting mosses on rocks, rarely on earth in their crevices 

 in alpine situations. — Diatr. Extremely local, having been met with 

 only on the Grampians, Scotland. — B. M. Craig Calliach and near 

 the summit of Ben Lawers, Perthshire ; Braemar, Aberdeenshire. 



2. L. fuscoluteum Mudd Man. p. 190, t. 3 fig. 73 (1861).— 

 Thallus effuse, thin, granulose-verrucose, white or greyish-white 

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

 elevato-sessile, at first slightly concave, then plane, sordid-orange- 

 coloured, ochraceo-pruinose, the margin persistent, thick, inflexed, 

 paler ; hypothecium colourless ; paraphyses slender, subconcrete, 

 tawny at the apices; epithecium granulose, K-|- purplish; spores 

 solitary, colourless, ellipsoid or oblong, at times difibrm, 

 0,048-100 mm. long, 0,024-55 mm. thick; hymenial gelatine 

 sordid-bluish, then, especially the asci, deep-red or tawny with 

 iodine. — Lichen fuscoluteus Dicks. PI. Crypt, ii. p. 18, t. 6. f. 2 

 (1790); Engl. Bot. t. 1007; With. Arr. ed. 3, iv. p. 24. 

 Lecidea fuscolutea Ach. in Vet. Acad. Handl. 1808, p. 266 ; 

 S. F. Gray Nat. Arr. i. p. 472 ; Hook, in Sm. Engl. Fl. v. p. 183 ; 

 Cromb. Lich. Brit. p. 75 ; Leight. Lich. Fl. p. 351 ; ed. 3, p. 380. 



Exsicc. Cromb. n. 87. 



Hab. Incrusting decaying mosses in alpine places. — Disir. Eare 

 in N. England and the Highlands of Scotland. — B. M. Teesdale, 

 Durham ; north side of Loch Tay, Ben Lawers and Craig Calliach, 

 Killin, Perthshire ; Ben Cruaohan, Argyll. 



