Dr. W. Nylander on new British Lichens. 349 
tuberculoso-prominula, rugoso-irregularia (latit. circiter 0°5 
millim.), epithecio haud semper distincto, perithecio ellip- 
soideo nigricante (vel lamina tenui rufescente) undique simi- 
lari; thecee polyspore ; spore ellipsoidez vel oblongz, seepius 
indistinct, 3-septate, long. 0°014—0:017 millim., crass. 
0:006-0:007 millim.; paraphyses graciles, et filamenta ostio- 
laria gracilia. Gelatina hymenea iodo cerulescens, dein sor- 
dide violacee tincta. 
Supra muscos depressos ad terram in micaceo-schistosis alpis 
Ben Lawers Scotiz. (Admiral Jones.) 
Pertusaria nolens, Nyl. 
Thallus cinereus, levigatus, areolato-rimosus, determinatus 
(crass. circiter 0°3 millim.) ; apothecia innata, (nulla promi- 
nentia thalli indicata, nec nisi) ostiolis (epitheciis) nigris, 
planiusculis, rotundatis, oblongis aut nonnihil difformibus 
(latit. 0°15-0°30 millim.), seepe 2 aut plura approximata, intus 
concoloria ; spore 8°, incolores, ellipsoidez (pariete medio- 
cri vel seepe tenui), longit. 0°030—0-042 millim., crass. 0°015— 
0:022 millim.; thecz cylindracese (iodo intense cerules- 
centes). 
Ad saxa basaltica prope Glenarm in Hibernia. (Admiral 
Jones.) 
Faciei est preecedentis, omnino forme Lecanore cineree, pro 
qua sumatur, nisi microscopice (et chemice) examinetur. 
Adhuc exemplum sistit nexus cum genere Lecanora ! 
Thelotrema subtile, Tuck. 
Thallus macula lactea vel albida subnitidiuscula indicatus ; apo- 
thecia incoloria (alba), erumpentia sat parva (latit. 0-4 millim.), 
margine thallodeo parum prominulo, proprio spe albo-pul- 
verulento; spore 8", incolores, oblongz, 10—13-loculares, 
longit. 0°040—0:056, crass. 0:009-0°010 millim. (iodo ceru- 
lescentes). 
In Hibernia, Kerry, ad corticem fagi. (Isaac Carroll, Esq.) 
Parum (et presertim sporis majoribus) differt a Thelotremate 
bicinctulo, Nyl. 
' Pyrenopsis diffundens, Nyl. 
Thallus niger, opacus, tenuis, areolato-squamulosus, squamulis 
subfurfureis sat parvis variis, effusus; apothecia rufescentia, 
innata (latit. 0°3 millim. vel minora), sepe gyalectoidea, at 
variantia planiuscula, intus tota pallida; spore 8"®, incolores, 
ellipsoideze, simplices, longit. 0-011-0:023 millim., crass. 
0:007-0'011 mullim.; paraphyses discrete, gracilescentes. 
