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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 5881 | Opegrapha vulgata f. steriza | (Ach.) Leight. | No | Opegrapha lithyrga | 951 | LC NS | ||||
| 5882 | Opegrapha vulgata var. siderella | auct. brit. | No | Opegrapha niveoatra | 953 | LC | ||||
| 5883 | Opegrapha vulgata var. subsiderella | Nyl. | No | Opegrapha niveoatra | 953 | LC | ||||
| 5884 | Opegrapha xanthodes | Nyl. (1878) | No | Gyrographa saxigena | 961 | LC NS Sc IR | ||||
| 5885 | Opegrapha xerica | Torrente & Egea (1992) | No | Alyxoria xerica | 1722 | LC NS | ||||
| 5886 | Opegrapha zonata | Körb. (1855) | No | Enterographa zonata | 967 | LC | ||||
| 5887 | Opegrapha zwackhii | (A. Massal. ex Zwackh) Källsten ex Hafellner (1994) | No | Phacographa zwackhii | 2133 | NE NR Sc | LF | |||
| 5888 | Opegrapha “sp. A" | sensu D. Hawksw. (1983) | No | Opegrapha brevis | 1841 | NT NR Sc IR | LF | |||
| 5889 | Opegrapha “sp. B" | sensu D. Hawksw. (1983) | No | Opegrapha thelotrematis | 1844 | LC NS Sc IR | LF | |||
| 5890 | Opeltia flavorubescens | (Huds.) S.Y. Londr. & Hur (2020) | No | Gyalolechia flavorubescens | 254 | EN A NS P Eng Sc Wa | ||||
| 5891 | Ophiobolus peltigerae | (Mont.) Sacc. | No | Neolamya peltigerae | 2127 | NE NR | LF | |||
| 5892 | Ophioparma lapponica | (Räsänen) Hafellner & R.W. Rogers | No | incorrectly reported from the British Isles | ||||||
| 5893 | Ophioparma ventosa | (L.) Norman (1853) | Yes | Ophioparma ventosa | Haematomma ventosum | 556 | LC | Ophioparma ventosa | ||
| 5894 | Orbicula tartaricola | (Nyl.) Cooke | No | Roselliniopsis tartaricola | 2190 | LC NS | LF | |||
| 5895 | Orcularia insperata | (Nyl.) Kalb & Giralt (2011) | Yes | Orcularia insperata | Buellia biloculata; Rinodina biloculata | 1282 | DD NR | Orcularia insperata | ||
| 5896 | Orphniospora atrata | (Sm.) Poelt | No | Orphniospora moriopsis var. moriopsis | 969 | LC NS | ||||
| 5897 | Orphniospora atrata var. brunnea | (A.L. Sm.) Poelt | No | Orphniospora moriopsis var. brunnea | 970 | NE NR | ||||
| 5898 | Orphniospora moriopsis var. brunnea | (A.L. Sm.) D. Hawksw. (1982) | Yes | Orphniospora moriopsis var. brunnea | Buellia atrata var. brunnea Orphniospora atrata var. brunnea |
970 | NE NR | Orphniospora moriopsis var. brunnea | ||
| 5899 | Orphniospora moriopsis var. moriopsis | (A. Massal.) D. Hawksw. (1982) | Yes | Orphniospora moriopsis var. moriopsis | Buellia atrataOrphniospora atrata | 969 | LC NS | Orphniospora moriopsis var. moriopsis | ||
| 5900 | Ovicuculispora parmeliae | (Berk. & M.A. Curtis) Etayo (2010) | No | Nectriopsis parmeliae | 2125 | NE | LF | |||
| 5901 | Oxneria coppinsii | (S. Kondratyuk & Kärnefelt & Søchting) S. Kondratyuk & Kärnefelt nom. inval. | No | ? Xanthoria ulophyllodes | ||||||
| 5902 | Oxneria fulva | (Hoffm.) S.Y. Kondr. & Kärnefelt (2003) | No | Xanthmendoza fulva | 1918 | DD NR | ||||
| 5903 | Oxneria ulophyllodes | (Räsänen) S.Y. Kondr. & Kärnefelt (2003) | No | Xanthomendoza ulophyllodes | 1909 | LC NS | ||||
| 5904 | Pachnolepia pruinata | (Pers.) Frisch & G, Thor (2014) | Yes | Pachnolepia pruinata | Arthonia impoita; Arthonia pruinata | 63 | LC | Pachnolepia pruinata | ||
| 5905 | Pachyospora verrucosa | (Ach.) A. Massal. | No | Megaspora verrucosa | 971 | NT NS | ||||
| 5906 | Pachyphiale carneola | (Ach.) Arnold (1871) | Yes | Pachyphiale carneola | Gyalecta carneola; Pachyphiale cornea | 972 | LC L | Pachyphiale carneola | ||
| 5907 | Pachyphiale cornea | (Tuck.) Poetsch (1872) | No | Pachyphiale carneola | 972 | LC L | ||||
| 5908 | Pachyphiale corticola | Lönnr. | No | Pachyphiale fagicola | 973 | NT NR Sc | ||||
| 5909 | Pachyphiale fagicola | (Hepp) Zwackh (1862) | Yes | Pachyphiale fagicola | Gyalecta fagicola; Pachyphiale corticola | 973 | NT NR Sc | Pachyphiale fagicola | ||
| 5910 | Pachyphiale ophiospora | Lettau (1937) | Yes | Pachyphiale ophiospora | Gyalecta ophiospora | 2676 | NE NR | Pachyphiale ophiospora |