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 Sort ascending | Authority | Is Current Name? | Current Taxon Name | Synonyms | BLS Number | Comments | Conservation Evaluation | Group | Account & Map |
|---|---|---|---|---|---|---|---|---|---|---|
| 8581 | Arthonia orbillifera | (Almq.) Sundin (1999) | No | Arthothelium orbilliferum | 1711 | LC NS Sc IR | F | |||
| 8582 | Arthonia opegraphina | (Ach.) Leight. | No | Arthonia radiata | 69 | LC | ||||
| 8583 | Arthonia norvegica | (Coppins & Tønsberg) McCune (2017) | No | Arthothelium norvegicum | 1743 | NT NR Sc | ||||
| 8584 | Arthonia neglectula | Nyl. (1874) | Yes | Arthonia neglectula | 2323 | NE NR | LF | Arthonia neglectula | ||
| 8585 | Arthonia myriocarpella | auct. brit. p.p., non Nyl. | No | Arthonia arthonioides | 51 | LC NS | ||||
| 8586 | Arthonia myriocarpella | Nyl. | No | Arthonia mediella | 413 | LC NS | ||||
| 8587 | Arthonia myriocarpella | No | 1849 | BLS number no longer used | ||||||
| 8588 | Arthonia muscigena | Th. Fr. (1865) | No | Bryostigma lapidicola | 1700 | LC NS | ||||
| 8589 | 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 | |
| 8590 | Arthonia meridionalis | Zahlbr. (1914) | Yes | Arthonia meridionalis | 2450 | VU D2 NR | Arthonia meridionalis | |||
| 8591 | Arthonia melaspermella | Nyl. | No | Rhizodiscina lignyota | Rhizodiscina lignyota (Fr.) Hafellner | F | ||||
| 8592 | Arthonia melantera | Ach. (1808) | No | Naevia punctiformis | 68 | LC | F | |||
| 8593 | Arthonia mediella | Nyl. (1859) | Yes | Arthonia mediella | Arthonia myriocarpella Arthonia hypnophila ad int. |
413 | LC NS | Arthonia mediella | ||
| 8594 | Arthonia lurida var. spadicea | (Leight.) Nyl. (1856) | No | Diarthonis spadicea | 70 | LC | ||||
| 8595 | Arthonia lurida | auct. brit. p.max.p. pre-1980 | No | Arthonia didyma | 56 | LC | ||||
| 8596 | Arthonia lurida | Ach. (1810) [nom. rejic.], non auct. brit. | No | Diarthonis spadicea | 70 | LC | ||||
| 8597 | Arthonia lurida | auct. brit. p.min.p., auct. europ. p.max.p. pre-1980 | No | Arthonia vinosa | 73 | LC L* | ||||
| 8598 | Arthonia lobata | (Flörke) A. Massal., et auct brit. p.min.p. | No | Sparria endlicheri | 59 | LC ?NS Sc | ||||
| 8599 | Arthonia lobata | auct. brit. p.max.p. | No | Dirina massiliensis f. sorediata | 500 | LC | ||||
| 8600 | Arthonia lirellans | Almq. (1880) | No | Arthothelium lirellans | 1569 | LC NS Sc IR | F | |||
| 8601 | Arthonia lilliei | B. de Lesd. (1910) | No | Catillaria lenticularis | 311 | LC | ||||
| 8602 | Arthonia ligniariella | Coppins (1989) | Yes | Arthonia ligniariella | 1742 | LC NS | Arthonia ligniariella | |||
| 8603 | Arthonia ligniaria | Hellb. (1884) | Yes | Arthonia ligniaria | 1536 | LC NS | Arthonia ligniaria | |||
| 8604 | Arthonia leucopellaea | (Ach.) Almq. (1880) | No | Felipes leucopellaeus | 65 | LC NS | ||||
| 8605 | Arthonia leucodontis | (Poelt & Döbbeler) Coppins (1989) | No | Bryostigma lapidicola | 1700 | LC NS | ||||
| 8606 | Arthonia lepidophila | auct. brit. | Yes | Arthonia lepidophila | 2747 | Parasitic on Cladonia. Name is not validly published. | NE NR | LF | ||
| 8607 | Arthonia lecanoricola | Alstrup & Olech (1996) | Yes | Arthonia lecanoricola | 2630 | lichenicolous in apothecia of Lecanora populicola | NE NR | LF | Arthonia lecanoricola | |
| 8608 | Arthonia lapidicola | (Taylor) Branth & Rostr. (1869) | No | Bryostigma lapidicola | 64 | name usually applied to what is now Arthonia fusca | LC NS | |||
| 8609 | Arthonia lapidicola | auct. | No | Arthonia fusca | 64 | LC | ||||
| 8610 | Arthonia invadens | Coppins (1989) | Yes | Arthonia invadens | 729 | NT NR E P Eng Sc IR | LF | Arthonia invadens |