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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 7501 | Rhizocarpon petraeum | (Wulfen) A. Massal. (1852) | Yes | Rhizocarpon petraeum | Rehmia oederi; Rehmia petraea; Rhizocarpon concentricum | 1249 | LC | Rhizocarpon petraeum | ||
| 7502 | Rhizocarpon petraeum var. concentricum | sensu Mudd | No | Rhizocarpon petraeum | 1249 | LC | ||||
| 7503 | Rhizocarpon petraeum var. excentricum | sensu A.L. Sm. | No | Rhizocarpon petraeum | 1249 | LC | ||||
| 7504 | Rhizocarpon petraeum var. lavatum | (Fr.) Mudd (1861) | No | Rhizocarpon lavatum | 1264 | LC | ||||
| 7505 | Rhizocarpon plicatile | auct. brit. p.p. | No | Rhizocarpon reductum | 1266 | name or specific epithet valid but has been misused in the past | LC | |||
| 7506 | Rhizocarpon plicatile | (Leight.) A.L. Sm. | No | Stereocaulon plicatile | 1269 | NT NR Sc IR | ||||
| 7507 | Rhizocarpon polycarpon | (Hepp) Th. Fr. [orth. var.] | No | Rhizocarpon polycarpum | 1270 | LC NS | ||||
| 7508 | Rhizocarpon polycarpum | (Hepp) Th. Fr. (1874) | Yes | Rhizocarpon polycarpum | Rhizocarpon polycarpon | 1270 | LC NS | Rhizocarpon polycarpum | ||
| 7509 | Rhizocarpon postumum | (Nyl.) Arnold (1870) | Yes | Rhizocarpon postumum | Rehmia postuma | 1271 | DD NR | Rhizocarpon postumum | ||
| 7510 | Rhizocarpon reductum | Th. Fr. (1874) | Yes | Rhizocarpon reductum | Rehmia reducta; Rhizocarpon obscuratum auct. p.p.; Rhizocarpon obscuratum var. reductum; Rhizocarpon rubescens auct. brit. pre-2020 | 1266 | LC | Rhizocarpon reductum | ||
| 7511 | Rhizocarpon richardii | (Lamy ex Nyl.) Zahlbr. (1926) | Yes | Rhizocarpon richardii | Rhizocarpon atlanticum Rhizocarpon constrictum |
1250 | LC | Rhizocarpon richardii | ||
| 7512 | Rhizocarpon ridescens | (Nyl.) Zahlbr. (1905) | Yes | Rhizocarpon ridescens | 2408 | NT NR Sc | Rhizocarpon ridescens | |||
| 7513 | Rhizocarpon riparium | Räsänen | No | Rhizocarpon geographicum | 1257 | LC | ||||
| 7514 | Rhizocarpon riparium subsp. lindsayanum | (Räsänen) Thomson | No | Rhizocarpon geographicum | 1257 | LC | ||||
| 7515 | Rhizocarpon riparium subsp. lindsayanum | No | 1273 | BLS number no longer used | ||||||
| 7516 | Rhizocarpon riparium subsp. riparium | No | 1272 | BLS number no longer used | ||||||
| 7517 | Rhizocarpon roridulum | (Th. Fr.) H. Olivier | No | incorrectly reported from the British Isles | ||||||
| 7518 | Rhizocarpon rubescens | Th. Fr. | Yes | Rhizocarpon rubescens | 1275 | NE NR | Rhizocarpon rubescens | |||
| 7519 | Rhizocarpon rubescens auct. brit. pre-2020 | auct. brit. pre-2020 | No | Rhizocarpon reductum | 1266 | LC | ||||
| 7520 | Rhizocarpon simillimum | (Anzi) Lettau (1912) | Yes | Rhizocarpon simillimum | 1893 | DD NR Sc | Rhizocarpon simillimum | |||
| 7521 | Rhizocarpon sinense | Zahlbr. (1923) | Yes | Rhizocarpon sinense | 2882 | NE NR | Rhizocarpon sinense | |||
| 7522 | Rhizocarpon soreumidium | (Stirt.) A.L. Sm. | No | Diplotomma alboatrum | 496 | LC | ||||
| 7523 | Rhizocarpon subgeminatum | Eitner (1911) [1910] | Yes | Rhizocarpon subgeminatum | 1276 | LC NS | Rhizocarpon subgeminatum | |||
| 7524 | Rhizocarpon sublavatum | Fryday (2000) | Yes | Rhizocarpon sublavatum | 1117 | LC NR Sc | Rhizocarpon sublavatum | |||
| 7525 | Rhizocarpon submodestum | (Vain.) Vain. (1922) | Yes | Rhizocarpon submodestum | 1387 | DD NR Sc | Rhizocarpon submodestum | |||
| 7526 | Rhizocarpon subpostumum | (Nyl.) Arnold (1877) | Yes | Rhizocarpon subpostumum | Rehmia subpostuma | 1214 | DD NR Sc | Rhizocarpon subpostumum | ||
| 7527 | Rhizocarpon superficiale | (Schaer.) Malme (1914) | Yes | Rhizocarpon superficiale | 1277 | DD NR Sc | Rhizocarpon superficiale | |||
| 7528 | Rhizocarpon superficiale subsp. boreale | Runemark | No | Rhizocarpon superficiale | 1277 | DD NR Sc | ||||
| 7529 | Rhizocarpon timdalii | Ihlen & Fryday (2002) | Yes | Rhizocarpon timdalii | Rehmia timdalii | 2335 | DD NR | Rhizocarpon timdalii | ||
| 7530 | Rhizocarpon tinei subsp. arcticum | Runemark | No | Rhizocarpon geographicum | 1257 | LC |