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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1801 | Circinaria contorta | (Hoffm.) A. Nordin, Savić & Tibell (2010) | Yes | Circinaria contorta | Aspicilia contorta subsp. contorta; Lecanora contorta | 107 | LC | Circinaria contorta | ||
| 1802 | Circinaria contorta subsp. hoffmanniana | (S. Ekman & Fröberg ex R. Sant.) I. Zhdanov (2013) | No | Circinaria hoffmanniana | 113 | LC NS | ||||
| 1803 | Circinaria cupreogrisea | (Th. Fr.) A. Nordin, Savić & Tibell (2010) | No | Aspicilia cupreogrisea | status of British material uncertain | NE | ||||
| 1804 | Circinaria hoffmanniana | (S. Ekman & Fröberg ex R. Sant.) A. Nordin (2016) | Yes | Circinaria hoffmanniana | Aspicilia contorta subsp. hoffmanniana; Lecanora hoffmannii | 113 | LC NS | Circinaria hoffmanniana | ||
| 1805 | Circinaria leprosescens | (Sandst.) A. Nordin, Savić & Tibell (2010) | Yes | Circinaria leprosescens | Aspicilia leprosescens; Lecanora leprosescens | 116 | LC | Circinaria leprosescens | ||
| 1806 | Circinaria tuberculosa | (Ach.) Coppins (2023) | Yes | Circinaria tuberculosa | Aspicilia tuberculosa; Lecanora tuberculosa | 1851 | Ex | Circinaria tuberculosa | ||
| 1807 | Cirrenalia lichenicola | Pérez-Ort. (2020) | Yes | Cirrenalia lichenicola | 2843 | on Mycoblastus caesius | NE NR | LF | ||
| 1808 | Cladina alpestris | (L.) Nyl. | No | Cladonia stellaris | 418 | |||||
| 1809 | Cladina arbuscula | (Wallr.) Hale & W.L. Culb. (1970) | No | Cladonia arbuscula subsp. arbuscula | 273 | most British records refer to the subsp. squarrosa | DD NR Sc | |||
| 1810 | Cladina ciliata | (Stirt.) Trass | No | Cladonia ciliata var. ciliata | 372 | LC | ||||
| 1811 | Cladina impexa | (Harm.) B. de Lesd. | No | Cladonia portentosa | 409 | LC | ||||
| 1812 | Cladina mediterranea | (P.A. Duvign. & Abbayes) Follmann & Hern.-Padr. | No | Cladonia mediterranea | 399 | CR D NR P Eng | ||||
| 1813 | Cladina mitis | (Sandst.) Mong. | No | Cladonia mitis | 402 | NT NR Sc | ||||
| 1814 | Cladina portentosa | (Dufour) Follmann | No | Cladonia portentosa | 409 | LC | ||||
| 1815 | Cladina rangiferina | (L.) Nyl. | No | Cladonia rangiferina | 411 | LC | ||||
| 1816 | Cladina stellaris | (Opiz) Brodo | No | Cladonia stellaris | 418 | |||||
| 1817 | Cladina tenuis | (Flörke) B. de Lesd. | No | Cladonia ciliata var. tenuis | 373 | LC | ||||
| 1818 | Cladonia acuminata | auct. brit. p.p. | No | Cladonia ramulosa | 359 | LC | ||||
| 1819 | Cladonia acuminata | auct. brit. p.p. | No | Cladonia squamosa var. subsquamosa | 417 | LC | ||||
| 1820 | Cladonia acuminata | (Ach.) Norrl. | No | 357 | incorrectly reported from the British Isles, BLS number no longer used | |||||
| 1821 | Cladonia alcicornis | (Lightf.) Fr. (1831) | No | Cladonia foliacea | 387 | LC | ||||
| 1822 | Cladonia alpestris | (L.) Rabenh. | No | Cladonia stellaris | 418 | |||||
| 1823 | Cladonia alpicola | (Flot.) Vain. | No | Cladonia macrophylla | 397 | LC NS | ||||
| 1824 | Cladonia alpina | (Asahina) Yoshim. (1968) | Yes | Cladonia alpina | 322 | DD NR Sc | Cladonia alpina | |||
| 1825 | Cladonia amaurocraea | auct. brit. | No | Cladonia uncialis subsp. biuncialis | 426 | LC | ||||
| 1826 | Cladonia amaurocraea | No | 358 | BLS number no longer used | ||||||
| 1827 | Cladonia angustiloba | Ahti & Aptroot (2009) | Yes | Cladonia angustiloba | 2668 | Recently considered a morph of Cladonia foliacea | NE LC | Cladonia angustiloba | ||
| 1828 | Cladonia anomaea | (Ach.) Ahti & P. James | No | Cladonia ramulosa | 359 | LC | ||||
| 1829 | Cladonia arbuscula | auct. brit. p.max.p. | No | Cladonia arbuscula subsp. squarrosa | 360 | LC | ||||
| 1830 | Cladonia arbuscula subsp. arbuscula | (Wallr.) Flot. (1839) | Yes | Cladonia arbuscula subsp. arbuscula | Cladina arbuscula p.min.p. | 273 | Apparently very rare, and confined to dunes in E. Scotland | DD NR Sc | Cladonia arbuscula subsp. arbuscula |