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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 5731 | Ochrolechia yasudae | auct. brit. | No | Ochrolechia subviridis | 927 | LC | ||||
| 5732 | Odontotrema firmatum | Nyl. | No | Exarmidium hemisphaericum | Exarmidium hemisphaericum (Fr.) Aptroot | F | ||||
| 5733 | Odontotrema minus | auct. brit | No | Exarmidium hemisphaericum | Exarmidium hemisphaericum (Fr.) Aptroot | F | ||||
| 5734 | Odontotrema pertusariae | Etayo, Diederich & Coppins (2002) | No | Sphaeropezia pertusariae | 2376 | NE NR | LF | |||
| 5735 | Olegblumia demissa | (Flot. ex Körb.) S.Y. Kondr., Lőkös, Jung Kim, A.S. Kondr., S.O. Oh & Hur (2020) | Yes | Olegblumia demissa | Caloplaca demissa | 2593 | NE NR | Olegblumia demissa | ||
| 5736 | Omphalina alpina | (Britzelm.) Bresinsky & Stangl | No | Lichenomphalia alpina | 935 | LC | ||||
| 5737 | Omphalina cupulatoides | P.D. Orton (1977) | No | Arrhenia cupulatoides | 2908 | NE NR | LF | |||
| 5738 | Omphalina ericetorum | (Pers.) M. Lange (1955) | No | Lichenomphalia ericetorum | 931 | LC | ||||
| 5739 | Omphalina fulvopallens | P.D. Orton (1984) | No | Lichenomphalia ericetorum | 931 | LC | ||||
| 5740 | Omphalina grisella | (P. Karst.) M.M. Moser (1953) | No | Lichenomphalia velutina | 932 | LC ? | ||||
| 5741 | Omphalina griseopallida | (Desm.) Quél. | No | Arrhenia griseopallida | Arrhenia griseopallida (Desm.) Watling. No longer considered to be lichenized | F | ||||
| 5742 | Omphalina griseopallida | No | 933 | BLS number no longer used | ||||||
| 5743 | Omphalina hudsoniana | (H.S. Jenn.) H.E. Bigelow | No | Lichenomphalia hudsoniana | 934 | |||||
| 5744 | Omphalina luteolilacina | (J. Favre) D.M. Hend. (1958) | No | Lichenomphalia hudsoniana | 934 | |||||
| 5745 | Omphalina luteovitellina | (Pilát & Nannf.) M. Lange | No | Lichenomphalia alpina | 935 | LC | ||||
| 5746 | Omphalina pararustica | Clémençon | No | Lichenomphalia velutina | 932 | LC ? | ||||
| 5747 | Omphalina pararustica | No | 1782 | BLS number no longer used | ||||||
| 5748 | Omphalina peltigerina | auct. brit. p.p. non (Peck) P. Collin | No | Arrhenia mohniensis | 2909 | NE NR | LF | |||
| 5749 | Omphalina pseudoandrosacea | No | 1783 | BLS number no longer used | ||||||
| 5750 | Omphalina pseudoandrosacea | (Bull.) M.M. Moser (1967) | No | Lichenomphalia ericetorum | 931 | LC | ||||
| 5751 | Omphalina umbellifera | auct. p.p. non (L. :Fr.) Quél. | No | Lichenomphalia ericetorum | 931 | LC | ||||
| 5752 | Omphalina velutina | (Quél.) Quél. | No | Lichenomphalia velutina | 932 | LC ? | ||||
| 5753 | Opegrapha abscondita | Th. Fr. | No | Lecanographa abscondita | 593 | LC NS | ||||
| 5754 | Opegrapha actophila | Nyl. | No | Opegrapha areniseda | 937 | LC NS Sc | ||||
| 5755 | Opegrapha amphotera | Nyl. | No | Opegrapha vulgata | 943 | LC | ||||
| 5756 | Opegrapha anomala | Leighton (1857) | No | Allographa anomala | 531 | LC NS Sc IR | ||||
| 5757 | Opegrapha anomea | Nyl. (1857) | Yes | Opegrapha anomea | 2477 | DD NR | LF | Opegrapha anomea | ||
| 5758 | Opegrapha areniseda | Nyl. (1875) | Yes | Opegrapha areniseda | Opegrapha actophila | 937 | LC NS Sc | Opegrapha areniseda | ||
| 5759 | Opegrapha arthoniicola in ed. | Coppins & S.Y. Kondr. in ed. | Yes | Opegrapha arthoniicola in ed. | 1994 | ; unpublished name | LC NS | LF | Opegrapha arthoniicola in ed. | |
| 5760 | Opegrapha atra | Pers. (1794) | No | Arthonia atra | 938 | LC |