CONTRIBUTIONS TO BRITISH LICHENOLOGY. 
257 
diocres, apice fuscescente crassiores et ibi vulgo aliquoties septato- 
articulatse ; hypothecium incolor. Jodo gelatina hymenea nonnihil cse- 
ruleseens.— On columnar basalt, Crogham, Killarney (Carroll). 
L.furvula, NyL Flora, October, 1866 (incorrectly printed fnrvella). 
Ben Lawers (Carroll). " Differt a subsimili L.furvella hypothecio 
atro, epithecio (et thalamic superne) cserulescente, sporis lninori- 
bus, etc.'' 
L. episema, Nyl. — Parasitic on thallus of Lecanora cinerea, shore of 
Kenmare Bay, near Dunkerron (Jones). 
L. atro-fuscescens, Nyl. Flora, 1866, p. 371.— Thallus cinereo-nigri- 
cans vel fusco-nigrescens, deplanatus, areolato-diffractus, subopacus ; 
nypothallus niger, hinc inde visibilis; apothecia nigra, adnata, plana 
(demum convexiuscula), marginata, mediocria (latit. 0'9-l'2 millim.), 
ssepe subangulosa, intus subiucoloria ; spora* 8-nae, incolores, ellipsoi- 
deae (longit. 0*018-20 millim., crassit. Q-009-0-011 millim.); epithe- 
cium fuscescens ; paraphyses gracilcs, tenerac, subirregulares ; hypothe- 
cium incolor. Gelatina hymenea iodo cscrulescens, dein (pro parte 
saltern) vinose rubescens. — Ben Lawers, on mica-slate (Carroll). " Fa- 
cie inter L. fusco-atram et JL. tembromm quasi media, sporis majoribus 
inter species subsimiles mox dignota (prater alias notas).' 
L.mesotropa, Nyl. Flora, 1867, p. 328. — Thallus cinerascens, verru- 
coso-areolatus, indeterminatus (mediocris crassitie) ; apothecia fusco- 
n, gra vel nigricantia, opaca, planiuscula, adnata (latit. 0'6-0'9 millim.), 
margine obtuso vel evanescente, intus albida ; sporae 8-me, ellipsoideae 
(longit. 0-009-0013 millim., crassit. 0*005-6 millim.); paraphyses 
gracilescentes, vulgo non discrete j epithecium fuscescens ; hypothecium 
incolor.— On rocks, Ben Lomond (Crombie). "Est quasi intermedia 
u *ter X. lapicidam et L. lithophUam, thallo fere illius, apotheciis fere 
aojus, nec forsan species propria. Apotliecia ssepe faciei biatorinae." 
L. umbonella, Nyl. Flora, 1866, p. 372=Z. umbonata, Mudd, 
Man. p. 204 (sed non Biatora uubonata, Hepp.).— Tbj|llu8 albidus vel 
pallidus, sat tenuis, determinates (maculatim vel insulatim crescens), 
rimoso-diffractus ; apothecia nigra, parva (latit. fere 0*5 millim.), innata, 
Marginata, saepius subgyrosa vel centro umbonata j sporse 8-na*, toco* 
lor es, effipsoideae (longit. 0*01 1-14 millim., crassit. 0*006-8 millim.) ; 
e pitheciuui subincolor; paraphyses mediocrcs ; hypothecium fuscu 
Vc l fuscescens (umbo et perithecium fusco-nigrieantia, in lami 
tcnui). Gelatina hymenea iodo bene caerulescens.— Ben more, on mica- 
e (Jones). « Prope L. gyrizantem locum habeat." 
