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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 301 | Arthonia cinnabarina var. opegraphina | auct. brit. p.min.p. | No | Coniocarpon fallax | 2760 | LC | ||||
| 302 | Arthonia cinnabarina var. opegraphina | auct. brit. p.max.p. | No | Coniocarpon cuspidans | 58 | LC | ||||
| 303 | Arthonia clemens | auct. brit. | No | Arthonia apotheciorum | 1501 | LC NS | LF | |||
| 304 | Arthonia cohabitans | Coppins (1989) | Yes | Arthonia cohabitans | 27 | Lichenicolous on Arthothelium macounii | VU D2 NR E P Sc IR | LF | Arthonia cohabitans | |
| 305 | Arthonia colombiana | Etayo (2000) | Yes | Arthonia colombiana | 2463 | NE NR | LF | Arthonia colombiana | ||
| 306 | Arthonia coronata | Etayo (1996) | Yes | Arthonia coronata | 2415 | LC NR | LF | Arthonia coronata | ||
| 307 | Arthonia decolorans | (Turner & Borrer ex Sm.) Erichsen | No | Dendrographa decolorans | 1315 | LC | ||||
| 308 | Arthonia dendritica | (Leight.) Cromb., non (Ach.) Dufour | No | Reichlingia dendritica | 53 | NT NR P Eng Sc Wa IR | ||||
| 309 | Arthonia destruens | Rabenh. (1868) | Yes | Arthonia destruens | 2564 | NE NR | LF | Arthonia destruens | ||
| 310 | Arthonia dictyospora | (Coppins & P. James) McCune (2017) | No | Arthothelium dictyosporum | 95 | NT NR E P Sc Wa IR | ||||
| 311 | Arthonia didyma | auct. brit. p.p. pre-1980 | No | Arthonia vinosa | 73 | name or specific epithet valid but has been misused in the past | LC L* | |||
| 312 | Arthonia didyma | Körb. (1853) | Yes | Arthonia didyma | Arthonia aspersella Arthonia dispersa auct. brit. Arthonia lurida auct. |
56 | Pre-1980 records usually referred to A. vinosa | LC | Arthonia didyma | |
| 313 | Arthonia digitatae | Hafellner (1999) | Yes | Arthonia digitatae | 2416 | LC NR | LF | Arthonia digitatae | ||
| 314 | Arthonia diploiciae | Calat. & Diederich (1995) | Yes | Arthonia diploiciae | 2009 | DD NR | LF | Arthonia diploiciae | ||
| 315 | Arthonia dispersa | auct. brit. p.p. | No | Arthonia didyma | 56 | LC | ||||
| 316 | Arthonia dispersa | auct. brit. p.p. | No | Arthonia excipienda | 1599 | NT NR Sc | F | |||
| 317 | Arthonia dispersa var. excipienda | (Nyl.) H. Olivier | No | Arthonia excipienda | 1599 | NT NR Sc | F | |||
| 318 | Arthonia elegans | (Ach.) Almq. (1880), auct. brit. p.min.p. | No | Coniocarpon fallax | 2760 | LC | ||||
| 319 | Arthonia elegans | auct. brit. p.max.p., non (Ach.) Almq. (1880) | No | Coniocarpon cuspidans | 58 | LC | ||||
| 320 | Arthonia endlicheri | (Garov.) Oxner (1956) | No | Sparria endlicheri | 59 | LC ?NS Sc | ||||
| 321 | Arthonia epicladonia | (Nyl.) Alstrup & Zhurb. (2004) | No | Zhurbenkoa epicladonia | 2199 | NE NR | LF | |||
| 322 | Arthonia epimela | (Norman ex Almq.) Minks (1892) | Yes | Arthonia epimela | 2818 | on Amandinea punctata | NE NR | LF | Arthonia epimela | |
| 323 | Arthonia epipasta | auct. brit. p.max.p. | No | Naevia punctiformis | 68 | LC | F | |||
| 324 | Arthonia epipasta | auct. brit. p.min.p. | No | Arthonia radiata | 69 | LC | ||||
| 325 | Arthonia epiphyscia | sensu D. Hawksw. (1983) p.p. | No | Arthonia phaeophysciae | 1982 | LC NR | LF | |||
| 326 | Arthonia epiphyscia | Nyl. (1875) | Yes | Arthonia epiphyscia | 122 | lichenicolous on Physcia | LC NR | LF | Arthonia epiphyscia | |
| 327 | Arthonia excipienda | (Nyl.) Leight. (1871) | Yes | Arthonia excipienda | Arthonia dispersa var. excipienda Arthonia hibernica |
1599 | NT NR Sc | F | Arthonia excipienda | |
| 328 | Arthonia exilis | auct. brit. | No | Bryostigma lapidicola | 1700 | LC NS | ||||
| 329 | Arthonia fusca | (A. Massal.) Hepp (1860) | Yes | Arthonia fusca | Arthonia lapidicola auct. | 64 | LC | Arthonia fusca | ||
| 330 | Arthonia fuscopurpurea | (Tul.) R. Sant. (1960) | Yes | Arthonia fuscopurpurea | 775 | LC NS | LF | Arthonia fuscopurpurea |