Dr. Nylander on new British Lichens. 61 
Differing from Pertusaria by the hymenium, thecz, and spores. 
The verrucze are often pale above. The aspect is altogether that 
of a Pertusaria, but its systematic place is near L. verrucosa 
(stirps Lecanore cinerea). 
6. Pertusaria gyrocheila, Nyl. 
Thallus cinerascens, subgranuloso-inequalis, rimoso-diffractus, 
mediocris (crass. fere 0°5 mill.) ; apothecia in tuberculis (altit. 
fere 2 millim., vulgo latit. 3-5 millim.) thelotremoidea, sim- 
plicia aut demum supra subgyrosis e margine thallino crasso 
subgyroso, epitheciis glypholecine compositis, hymenio pal- 
lido; sporze 8"®, incolores, ellipsoidez, longit. circiter 0-068- 
0-070, crassit.0°036—0-050 millim. Gelatina hymenea et thecz 
iodo czerulescentes. 
Discovered by Isaac Carroll, Esq., 1864, near the summit of 
Ben Lawers. 
A very singular species, the verruce of the apothecia being 
crateriform. 
7. Pertusaria ophthalmiza, Ny]. 
Sporis usque longit. 0°160-0:205, crassit. 0'080-0:100 millim. 
E Discovered by Admiral Jones and Mr. I. Carroll, on Pine, 
Glenfalloch, Scotland. 
8. Lecidea diducens, Nyl. 
Thallus vix ullus; apothecia nigra, mediocria, plana, marginata 
(margine szepius flexuoso), intus obscura ; spore 8"®, incolores, 
ellipsoideze vel oblong, longit. 0'008-0:009, crassit. 0°0035— 
0:0045 millim. ; hypothecium fuscum ; paraphyses crasse, di- 
stinctze (crass. circiter 0:0035 millim.), apice clavato, nigro vel 
nigricante. Gelatina hymenea iodo cerulescens. 
Discovered on felspathic rocks in Jersey, by Charles Larba- 
lestier, Esq. 
The aggregate apothecia, absence of thallus, small spores, and 
thick paraphyses keep this species distinct. 
9. Lecidea rhizobola, Nyl. 
Thallus castaneo-fuscus vel lurido-fuscescens, squamosus, squamis 
rigidis, rotundatis vel rotundato-difformibus (latit. 4-7 mil- 
lim.), margine crenatis, subtus pallidis vel albidis, meequalibus, 
centroque longe radicatis; apothecia nigricantia, mediocria, 
intus albido-pallida ; spor 8", oblongo-ellipsoidez, simplices, 
longit. 0-012—0:016, crassit. 0°006-0:007 millim. ; paraphyses 
haud bene discretae. Gelatina hymenea iodo vinose rubens. 
Discovered by Admiral Jones, on Ben Lawers, Scotland. 
Allied to Lecidea globifera, Ach., and conspicuous by the hori- 
zontal thalline scales having long and divided roots. 
