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 | Chromatochlamys muscorum var. muscorum | (TH. Fr.) H. Mayrhofer & Poelt (1985) | No | Thelenella muscorum var. muscorum | 901 | LC | ||||
| 1802 | Chromatochlamys muscorum var. octospora | (Nyl.) H. Mayrhofer & Poelt | No | Thelenella muscorum var. octospora | 1778 | NE NR Sc | ||||
| 1803 | Chrysothrix candelaris | (L.) J.R. Laundon (1981) | Yes | Chrysothrix candelaris | Lepraria candelaris | 354 | LC | Chrysothrix candelaris | ||
| 1804 | Chrysothrix chlorina | (Ach.) J.R. Laundon (1981) | Yes | Chrysothrix chlorina | Lepraria chlorina | 355 | LC NS | Chrysothrix chlorina | ||
| 1805 | Chrysothrix chrysophthalma | auct. p.p. [with sorediate thallus] | No | Chrysothrix flavovirens | 1925 | name or specific epithet valid but has been misused in the past | LC | |||
| 1806 | Chrysothrix chrysophthalma | (P. James) P. James & J.R. Laundon (1981) | Yes | Chrysothrix chrysophthalma | Micarea chrysophthalma | 356 | NT NR Sc IR | Chrysothrix chrysophthalma | ||
| 1807 | Chrysothrix flavovirens | Tønsberg (1994) | Yes | Chrysothrix flavovirens | Chrysothrix chrysophthalma auct. p.p. | 1925 | LC | Chrysothrix flavovirens | ||
| 1808 | Ciliomyces oropensis | (Ces.) Höhn. | No | Paranectria oropensis subsp. oropensis | 2135 | Paranectria oropensis subsp. oropensis{LF} | LC NS | LF | ||
| 1809 | Circinaria caesiocinerea | (Nyl. ex Malbr.) A. Nordin, Savić & Tibell (2010) | Yes | Circinaria caesiocinerea | Aspicilia caesiocinerea; Aspicilia gibbosa auct. brit.; Lecanora gibbosa auct. brit. | 102 | LC | Circinaria caesiocinerea | ||
| 1810 | Circinaria calcarea | (L.) A. Nordin, Savić & Tibell (2010) | Yes | Circinaria calcarea | Aspicilia calcarea; Lecanora calcarea | 103 | LC | Circinaria calcarea | ||
| 1811 | Circinaria contorta | (Hoffm.) A. Nordin, Savić & Tibell (2010) | Yes | Circinaria contorta | Aspicilia contorta subsp. contorta; Lecanora contorta | 107 | LC | Circinaria contorta | ||
| 1812 | Circinaria contorta subsp. hoffmanniana | (S. Ekman & Fröberg ex R. Sant.) I. Zhdanov (2013) | No | Circinaria hoffmanniana | 113 | LC NS | ||||
| 1813 | Circinaria cupreogrisea | (Th. Fr.) A. Nordin, Savić & Tibell (2010) | No | Aspicilia cupreogrisea | status of British material uncertain | NE | ||||
| 1814 | 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 | ||
| 1815 | Circinaria leprosescens | (Sandst.) A. Nordin, Savić & Tibell (2010) | Yes | Circinaria leprosescens | Aspicilia leprosescens; Lecanora leprosescens | 116 | LC | Circinaria leprosescens | ||
| 1816 | Circinaria tuberculosa | (Ach.) Coppins (2023) | Yes | Circinaria tuberculosa | Aspicilia tuberculosa; Lecanora tuberculosa | 1851 | Ex | Circinaria tuberculosa | ||
| 1817 | Cirrenalia lichenicola | Pérez-Ort. (2020) | Yes | Cirrenalia lichenicola | 2843 | on Mycoblastus caesius | NE NR | LF | Cirrenalia lichenicola | |
| 1818 | Cladina alpestris | (L.) Nyl. | No | Cladonia stellaris | 418 | |||||
| 1819 | 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 | |||
| 1820 | Cladina ciliata | (Stirt.) Trass | No | Cladonia ciliata var. ciliata | 372 | LC | ||||
| 1821 | Cladina impexa | (Harm.) B. de Lesd. | No | Cladonia portentosa | 409 | LC | ||||
| 1822 | Cladina mediterranea | (P.A. Duvign. & Abbayes) Follmann & Hern.-Padr. | No | Cladonia mediterranea | 399 | CR D NR P Eng | ||||
| 1823 | Cladina mitis | (Sandst.) Mong. | No | Cladonia mitis | 402 | NT NR Sc | ||||
| 1824 | Cladina portentosa | (Dufour) Follmann | No | Cladonia portentosa | 409 | LC | ||||
| 1825 | Cladina rangiferina | (L.) Nyl. | No | Cladonia rangiferina | 411 | LC | ||||
| 1826 | Cladina stellaris | (Opiz) Brodo | No | Cladonia stellaris | 418 | |||||
| 1827 | Cladina tenuis | (Flörke) B. de Lesd. | No | Cladonia ciliata var. tenuis | 373 | LC | ||||
| 1828 | Cladonia acuminata | auct. brit. p.p. | No | Cladonia ramulosa | 359 | LC | ||||
| 1829 | Cladonia acuminata | auct. brit. p.p. | No | Cladonia squamosa var. subsquamosa | 417 | LC | ||||
| 1830 | Cladonia acuminata | (Ach.) Norrl. | No | 357 | incorrectly reported from the British Isles, BLS number no longer used |