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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2011 | Cladonia squamosa var. leptophylla | (Ach.) Schaer. | No | Cladonia peziziformis | 365 | CR A NR P Eng Sc Wa | ||||
| 2012 | Cladonia squamosa var. sparassa | (Ach.) auct. | No | Cladonia squamosa var. squamosa | 2365 | LC | ||||
| 2013 | Cladonia squamosa var. squamosa | (Scop.) Hoffm. (1796) | Yes | Cladonia squamosa var. squamosa | 2365 | LC | Cladonia squamosa var. squamosa | |||
| 2014 | Cladonia squamosa var. subsquamosa | (Nyl. ex Leight.) Vain. (1881) | Yes | Cladonia squamosa var. subsquamosa | Cladonia squamosa var. allosquamosa Cladonia subsquamosa |
417 | LC | Cladonia squamosa var. subsquamosa | ||
| 2015 | Cladonia stellaris | (Opiz) Pouzar & Vězda (1971) | Yes | Cladonia stellaris | Cladonia alpestris | 418 | doubtfully British | Cladonia stellaris | ||
| 2016 | Cladonia stereoclada | Abbayes (1947) | Yes | Cladonia stereoclada | 419 | DD NR Sc | Cladonia stereoclada | |||
| 2017 | Cladonia straminea | (Sommerf) Flörke (1828) | Yes | Cladonia straminea | Cladonia metacorallifera | 401 | DD NR Sc | Cladonia straminea | ||
| 2018 | Cladonia strepsilis | (Ach.) Mont. (1839) | Yes | Cladonia strepsilis | 420 | LC | Cladonia strepsilis | |||
| 2019 | Cladonia stricta | auct. brit. | No | Cladonia trassii | 1590 | Cladonia trassii Ahti | VU D2 NR Sc S8 | |||
| 2020 | Cladonia stygia | (Fr.) Ruoss (1985) | Yes | Cladonia stygia | 425 | DD NR Sc | Cladonia stygia | |||
| 2021 | Cladonia subcervicornis | (Vain.) Kernst. (1900) | Yes | Cladonia subcervicornis | 421 | LC | Cladonia subcervicornis | |||
| 2022 | Cladonia subfurcata | (Nyl.) Arnold | No | incorrectly reported from the British Isles | ||||||
| 2023 | Cladonia subimpexa | P.A. Duvign. {CR} | No | Cladonia portentosa | 409 | LC | CR | |||
| 2024 | Cladonia subrangiformis | Sandst. | No | Cladonia furcata subsp. subrangiformis | 390 | LC | ||||
| 2025 | Cladonia subsquamosa | (Nyl. ex Leight.) Cromb., non Kremp. | No | Cladonia squamosa var. subsquamosa | 417 | LC | ||||
| 2026 | Cladonia subulata | (L.) F.H. Wigg. (1780) | Yes | Cladonia subulata | Cladonia cornutoradiata | 422 | LC | Cladonia subulata | ||
| 2027 | Cladonia sulphurina | (Michx.) Fr. (1831) | Yes | Cladonia sulphurina | Cladonia deformis auct. p.p. Cladonia gonecha |
423 | LC | Cladonia sulphurina | ||
| 2028 | Cladonia sylvatica | auct. | No | Cladonia arbuscula | Cladonia arbuscula s. lat., records often include Cladonia ciliata and Cladonia portentosa | |||||
| 2029 | Cladonia symphycarpa | (Flörke) Fr. (1826) | Yes | Cladonia symphycarpa | Cladonia symphycarpia auct. | 424 | LC NS Sc | Cladonia symphycarpa | ||
| 2030 | Cladonia symphycarpia | (Flörke) Fr. (1826) | No | Cladonia symphycarpa | 424 | orth. error | LC NS Sc | |||
| 2031 | Cladonia tenuis | s. lat. | No | Cladonia ciliata s. lat. | Cladonia ciliata s. lat. | LC | ||||
| 2032 | Cladonia tenuis var. leucophaea | (Abbayes) Ahti | No | Cladonia ciliata var. ciliata | 372 | LC | ||||
| 2033 | Cladonia tenuis var. tenuis | (Flörke) Harm. | No | Cladonia ciliata var. tenuis | 373 | LC | ||||
| 2034 | Cladonia teuvoana | Pino-Bodas, Burgaz & Aptroot (2024) | Yes | Cladonia teuvoana | 2904 | member of C. cervicornis group | NE NR | |||
| 2035 | Cladonia trassii | Ahti (1998) | Yes | Cladonia trassii | Cladonia stricta auct. brit. | 1590 | VU D2 NR Sc S8 | Cladonia trassii | ||
| 2036 | Cladonia turgida | Hoffm. | No | incorrectly reported from the British Isles | ||||||
| 2037 | Cladonia umbricola | Tønsberg & Ahti (1980) | Yes | Cladonia umbricola | Cladonia polydactyla var. umbricola | 1750 | sometimes considered a chemotype of Cladonia polydactyla | DD NR | CR | Cladonia umbricola |
| 2038 | Cladonia uncialis | auct. brit. p.max.p. | No | Cladonia uncialis subsp. biuncialis | 426 | LC | ||||
| 2039 | Cladonia uncialis subsp. biuncialis | (Hoffm.) M. Choisy (1951) | Yes | Cladonia uncialis subsp. biuncialis | Cladonia uncialis | 426 | LC | Cladonia uncialis subsp. biuncialis | ||
| 2040 | Cladonia uncialis subsp. dicraea | (Ach.) D. Hawksw. | No | Cladonia uncialis subsp. biuncialis | 426 | LC |