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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 361 | Arthonia ligniariella | Coppins (1989) | Yes | Arthonia ligniariella | 1742 | LC NS | Arthonia ligniariella | |||
| 362 | Arthonia lilliei | B. de Lesd. (1910) | No | Catillaria lenticularis | 311 | LC | ||||
| 363 | Arthonia lirellans | Almq. (1880) | No | Arthothelium lirellans | 1569 | LC NS Sc IR | F | |||
| 364 | Arthonia lobata | (Flörke) A. Massal., et auct brit. p.min.p. | No | Sparria endlicheri | 59 | LC ?NS Sc | ||||
| 365 | Arthonia lobata | auct. brit. p.max.p. | No | Dirina massiliensis f. sorediata | 500 | LC | ||||
| 366 | Arthonia lurida | auct. brit. p.max.p. pre-1980 | No | Arthonia didyma | 56 | LC | ||||
| 367 | Arthonia lurida | Ach. (1810) [nom. rejic.], non auct. brit. | No | Diarthonis spadicea | 70 | LC | ||||
| 368 | Arthonia lurida | auct. brit. p.min.p., auct. europ. p.max.p. pre-1980 | No | Arthonia vinosa | 73 | LC L* | ||||
| 369 | Arthonia lurida var. spadicea | (Leight.) Nyl. (1856) | No | Diarthonis spadicea | 70 | LC | ||||
| 370 | Arthonia mediella | Nyl. (1859) | Yes | Arthonia mediella | Arthonia myriocarpella Arthonia hypnophila ad int. |
413 | LC NS | Arthonia mediella | ||
| 371 | Arthonia melantera | Ach. (1808) | No | Naevia punctiformis | 68 | LC | F | |||
| 372 | Arthonia melaspermella | Nyl. (1865) | No | Rhizodiscina lignyota | Rhizodiscina lignyota (Fr.) Hafellner | F | ||||
| 373 | Arthonia meridionalis | Zahlbr. (1914) | Yes | Arthonia meridionalis | 2450 | VU D2 NR | Arthonia meridionalis | |||
| 374 | Arthonia molendoi | (Heufl. ex Frauenf.) R. Sant. (1986) | Yes | Arthonia molendoi | 1934 | parasitic on Caloplaca s. lat. [Calogya and Variospora] | LC NR | LF | Arthonia molendoi | |
| 375 | Arthonia muscigena | Th. Fr. (1865) | No | Bryostigma lapidicola | 1700 | LC NS | ||||
| 376 | Arthonia myriocarpella | auct. brit. p.p., non Nyl. | No | Arthonia arthonioides | 51 | LC NS | ||||
| 377 | Arthonia myriocarpella | Nyl. (1863) | No | Arthonia mediella | 413 | LC NS | ||||
| 378 | Arthonia myriocarpella | No | 1849 | BLS number no longer used | ||||||
| 379 | Arthonia neglectula | Nyl. (1874) | Yes | Arthonia neglectula | 2323 | NE NR | LF | Arthonia neglectula | ||
| 380 | Arthonia norvegica | (Coppins & Tønsberg) McCune (2017) | No | Arthothelium norvegicum | 1743 | NT NR Sc | ||||
| 381 | Arthonia opegraphina | (Ach.) Leight. | No | Arthonia radiata | 69 | LC | ||||
| 382 | Arthonia orbillifera | (Almq.) Sundin (1999) | No | Arthothelium orbilliferum | 1711 | LC NS Sc IR | F | |||
| 383 | Arthonia pannariae | Zhurb. & Grube (2010) | Yes | Arthonia pannariae | 2576 | lichenicolous on Psoroma hypnorum | NE NR | LF | Arthonia pannariae | |
| 384 | Arthonia paralia | Nyl. (1877) | No | Arthonia phaeobaea | 67 | LC NS | ||||
| 385 | Arthonia parietinaria | Hafellner & A. Fleischhacker (2016) | Yes | Arthonia parietinaria | 2683 | parasitic on Xanthoria parietina | NE NS | LF | Arthonia parietinaria | |
| 386 | Arthonia patellulata | auct. brit. p.p. | No | Arthonia didyma | 56 | name or specific epithet valid but has been misused in the past | LC | |||
| 387 | Arthonia patellulata | auct. brit. p.p. | No | Bryostigma lapidicola | 1700 | name or specific epithet valid but has been misused in the past | LC NS | |||
| 388 | Arthonia patellulata | Nyl. (1853) | Yes | Arthonia patellulata | 66 | NT NS P Sc | Arthonia patellulata | |||
| 389 | Arthonia peltigerea | Th. Fr. (1866) | Yes | Arthonia peltigerea | 1935 | NE NR | LF | Arthonia peltigerea | ||
| 390 | Arthonia phaeobaea | (Norman) Norman (1869) | Yes | Arthonia phaeobaea | 67 | LC NS | Arthonia phaeobaea |