62 Dr. Nylander on new British Lichens. 
10. Lecidea luteella, Nyt. 
Thallus albus, tenuissimus vel macula alba indicatus; apothecia 
lutea (pallido-lutescentia), parva, marginata (vel submarginata, 
juvenilia gyalectoidea), intus incoloria; spore 8°®, oblong 
vel oblongo-fusiformes, 1-septatz, longit. 0°016-0-023, crassit. 
0-006-0-007 millim. ; thecze apice szepius crasse solide ; para- 
physes graciles. 
Discovered by Admiral Jones, on calcareous stones in Ireland. 
Its systematic place is after L. erysiboides, Nyl. 
11. Lecidea contristans, Ny). 
Thallus fuscus vel fusco-nigricans, tenuis, granulosus ; apothecia 
nigra (latit. 0°6-0-9 millim.), convexiuscula, immarginata, 
intus obscura; spore 8", incolores, ellipsoidez vel oblongze, 
1-septatee, longit.0°-010-0-014, crassit.0-0045-0-0065 millim. ; 
paraphyses haud discretz; epithecium nigricans; hypothectum 
sordide tinctum. Gelatina hymenea iodo cerulescens, dem 
sordide lutescens. 
Discovered by Isaac Carroll, Esq. (1864), on decaying Andree 
on the summit of Ben Lawers. 
Systematically near L. melena, Ny). 
12. Lecidea premneoides, Ach. 
Thallus pallido-virescensvel cineraceo-virescens, tenuiter leprosus, 
effusus; apothecia nigra, mediocria, marginata, plana, epi- 
thecio interdum subvirescenti-suffuso ; spore 8"”, incolores, 
oblong (obsolete vel tenuiter 3-septatz), longit. 0-019-0-025, 
crassit. 0°007—0°008 millim.; paraphyses gracilescentes ; hy- 
pothecium nigrum. Gelatina hymenea iodo vinose rubens. 
Discovered on walls in the island of Jersey, by Charles Larba- 
lestier, Esq. 
Allied to L. aromatica, Ach., and ZL. granosa, Tuck (thallus 
albidus vel albido-cinerascens, apothecia minora, &c.), but with 
the aspect of L. premnea, Ach. 
13. Opegrapha lentiginosula, Nyl. 
Thallus vix ullus; apothecia minutula (longit. 0°25 millim.), 
ellipsoidea (vel raro semel divisa), epithecio rimiformi; spore 
fuscee, ovoideze, 1-septatze (ad septum constrictiuscule), longit. 
0:020-0:023, ecrassit. 0°010-0°011 muillim.; paraphyses vix 
ulle ; hypothecium in color. Gelatina hymenea iodo vix vel 
obsolete czerulescens. 
Discovered by Isaac Carroll, Esq. (1864), on pine-bark at 
Glenfalloch, Scotland. 
