For more information see the Supplementary Notes for the Taxon Dictionary, which explains the names and synonyms, and these Instructions on how to use the online Taxon Dictionary which includes details of the Conservation Evaluation codes.
| Count | Name | Authority | Is Current Name? | Current Taxon Name | Synonyms | BLS Number | Comments | Conservation Evaluation | Group | Account & Map |
|---|---|---|---|---|---|---|---|---|---|---|
| 241 | Anisomeridium viridescens | (Coppins) R.C. Harris (1995) | Yes | Anisomeridium viridescens | Arthopyrenia viridescens | 1607 | LC NS Sc IR | Anisomeridium viridescens | ||
| 242 | Antennulariella lichenisata | Coppins & Aptroot (2008) | Yes | Antennulariella lichenisata | 2500 | LC NS E IR | Antennulariella lichenisata | |||
| 243 | Anthracothecium hibernicum | (Nyl.) A.L. Sm. (1911) | No | Pyrenula hibernica | 1036 | VU D2 NR P Sc Wa S8 IR | ||||
| 244 | Anthracothecium pyrenuloides | auct. brit. non (Mont.) Müll. Arg. | No | Pyrenula hibernica | 1036 | VU D2 NR P Sc Wa S8 IR | ||||
| 245 | Anziella adglutinata | (Anzi) Gyeln. | No | Placynthium flabellosum | 1135 | LC NS | ||||
| 246 | Aphanopsis coenosa | (Ach.) Coppins & P. James (1984) | Yes | Aphanopsis coenosa | 728 | LC NR Sc | Aphanopsis coenosa | |||
| 247 | Aquacidia antricola | (Hulting) Aptroot (2018) | Yes | Aquacidia antricola | Bacidia antricola; Bacidia byssoboliza; Bacidea carneoglauca; Verrucaria torta | 139 | LC NS | Aquacidia antricola | ||
| 248 | Aquacidia trachona | (Ach.) Aptroot (2018) | Yes | Aquacidia trachona | Bacidia trachona | 170 | LC NS | Aquacidia trachona | ||
| 249 | Aquacidia viridifarinosa | (Coppins & P. James) Aptroot (2018) | Yes | Aquacidia viridifarinosa | Bacidia viridifarinosa | 1583 | LC | Aquacidia viridifarinosa | ||
| 250 | Arctomia delicatula | Th. Fr. (1860) | Yes | Arctomia delicatula | Placynthium delicatulum | 50 | NT NR Sc | Arctomia delicatula | ||
| 251 | Arctomia fascicularis | (L.) Otálora & Wedin (2013) | No | Gabura fascicularis | 444 | NT NS P Sc WaL IR | ||||
| 252 | Arctoparmelia incurva | (Pers.) Hale (1986) | Yes | Arctoparmelia incurva | Parmelia incurva | 1000 | LC | Arctoparmelia incurva | ||
| 253 | Arrhenia griseopallida | (Desm.) Watling (1989) | Yes | Arrhenia griseopallida | Omphalina griseopallida | No longer considered to be lichenized | NE | F | ||
| 254 | Arrhenia peltigerina | (Peck) Redhead, Lutzoni, Moncalvo & Vilgalys (2002) | Yes | Arrhenia peltigerina | Omphalina cupulatoides | 913 | NE NR | LF | Arrhenia peltigerina | |
| 255 | Arthonia abelonae | P.M. Jørg. (1970) [orth. error] | No | Corticiruptor abeloneae | 1915 | NT NR | ||||
| 256 | Arthonia abeloneae | P.M. Jørg. (1970) | No | Corticiruptor abeloneae | 1915 | lichenicolous on Sticta 'doufourii' | NT NR | LF | ||
| 257 | Arthonia almquistii | Vain. (1883) | Yes | Arthonia almquistii | 771 | NE NR Sc | LF | Arthonia almquistii | ||
| 258 | Arthonia amylospora | Almq. (1880) | Yes | Arthonia amylospora | 1930 | LC NR Sc | LF | Arthonia amylospora | ||
| 259 | Arthonia anastomosans | auct. brit. p.p. | No | Arthothelium lirellans | 1569 | LC NS Sc IR | F | |||
| 260 | Arthonia anastomosans | auct. brit. p.p. | No | Arthothelium orbilliferum | 1711 | LC NS Sc IR | F | |||
| 261 | Arthonia anglica | Coppins (1989) | Yes | Arthonia anglica | 1686 | EN B, D NR P Eng IR | Arthonia anglica | |||
| 262 | Arthonia anombrophila | Coppins & P. James (1989) | No | Reichlingia anombrophila | 1588 | LC NS Sc IR | ||||
| 263 | Arthonia apatetica | (A. Massal.) Th. Fr. (1866) | Yes | Arthonia apatetica | 2418 | DD NR Sc | Arthonia apatetica | |||
| 264 | Arthonia apotheciorum | (A. Massal.) Almq. (1880) | Yes | Arthonia apotheciorum | Arthonia clemens auct. brit. | 1501 | LC NS | LF | Arthonia apotheciorum | |
| 265 | Arthonia armoricana | Leight. non Nyl. | No | Synarthonia astroidestera | 1687 | NT NS IR | ||||
| 266 | Arthonia arthonioides | (Ach.) A.L. Sm. (1911) | Yes | Arthonia arthonioides | Arthonia aspersa | 51 | LC NS | Arthonia arthonioides | ||
| 267 | Arthonia aspersa | Leight. (1856) | No | Arthonia arthonioides | 51 | LC NS | ||||
| 268 | Arthonia aspersella | Leight. | No | Arthonia didyma | 56 | LC | ||||
| 269 | Arthonia astroidea | Ach. | No | Arthonia radiata | 69 | LC | ||||
| 270 | Arthonia astroidea var. simulans | Leight. | No | Arthonia radiata | 69 | LC |