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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 7321 | Rhizocarpon obscuratum | (Ach.) A. Massal. | No | Rhizocarpon lavatum | 1264 | LC | ||||
| 7322 | Rhizocarpon obscuratum | auct. p.p. | No | Rhizocarpon reductum | 1266 | LC | ||||
| 7323 | Rhizocarpon obscuratum subsp. roridulum | sensu A.L. Sm., non Th. Fr. | No | ? Rhizocarpon lavatum | ||||||
| 7324 | Rhizocarpon obscuratum var. reductum | (Th. Fr.) Eitner | No | Rhizocarpon reductum | 1266 | LC | ||||
| 7325 | Rhizocarpon obscuratum var. roridulum | (Th. Fr.) Elenkin | No | Rhizocarpon roridulum | Rhizocarpon roridulum (Th. Fr. ) H. Olivier, incorrectly reported from the British Isles | |||||
| 7326 | Rhizocarpon obscuratum var. roridulum | auct. brit., non (Th. Fr.) Elenkin | No | ? Rhizocarpon lavatum | ||||||
| 7327 | Rhizocarpon oceanicum | Fryday ad int. | No | Rhizocarpon infernulum f. sylvaticum | 1037 | LC NS | ||||
| 7328 | Rhizocarpon ochrolechiae | (Poelt & Nimis) Hafellner (1992) | Yes | Rhizocarpon ochrolechiae | 1892 | NE NR Sc | LF | Rhizocarpon ochrolechiae | ||
| 7329 | Rhizocarpon oederi | (Ach.) Körb. (1861) | Yes | Rhizocarpon oederi | 1267 | LC M* | Rhizocarpon oederi | |||
| 7330 | Rhizocarpon orphninum | (Vain.) Zahlbr. | No | ? Rhizocarpon distinctum | ||||||
| 7331 | Rhizocarpon perlutum | (Nyl.) Zahlbr. | No | Rhizocarpon petraeum | 1249 | LC | ||||
| 7332 | Rhizocarpon petraeum | (Wulfen) A. Massal. (1852) | Yes | Rhizocarpon petraeum | Rhizocarpon concentricum | 1249 | LC | Rhizocarpon petraeum | ||
| 7333 | Rhizocarpon petraeum var. concentricum | sensu Mudd | No | Rhizocarpon petraeum | 1249 | LC | ||||
| 7334 | Rhizocarpon petraeum var. excentricum | sensu A.L. Sm. | No | Rhizocarpon petraeum | 1249 | LC | ||||
| 7335 | Rhizocarpon petraeum var. lavatum | (Fr.) Mudd | No | Rhizocarpon lavatum | 1264 | LC | ||||
| 7336 | Rhizocarpon plicatile | auct. brit. p.p. | No | Rhizocarpon reductum | 1266 | name or specific epithet valid but has been misused in the past | LC | |||
| 7337 | Rhizocarpon plicatile | (Leight.) A.L. Sm. | No | Stereocaulon plicatile | 1269 | NT NR Sc IR | ||||
| 7338 | Rhizocarpon polycarpon | (Hepp) Th. Fr. [orth. var.] | No | Rhizocarpon polycarpum | 1270 | LC NS | ||||
| 7339 | Rhizocarpon polycarpum | (Hepp) Th. Fr. (1874) | Yes | Rhizocarpon polycarpum | Rhizocarpon polycarpon | 1270 | LC NS | Rhizocarpon polycarpum | ||
| 7340 | Rhizocarpon postumum | (Nyl.) Arnold (1870) | Yes | Rhizocarpon postumum | 1271 | DD NR | Rhizocarpon postumum | |||
| 7341 | Rhizocarpon reductum | Th. Fr. (1874) | Yes | Rhizocarpon reductum | Rhizocarpon obscuratum auct. p.p.; Rhizocarpon obscuratum var. reductum; Rhizocarpon rubescens auct. brit. pre-2020 | 1266 | LC | Rhizocarpon reductum | ||
| 7342 | Rhizocarpon richardii | (Lamy ex Nyl.) Zahlbr. (1926) | Yes | Rhizocarpon richardii | Rhizocarpon atlanticum Rhizocarpon constrictum |
1250 | LC | Rhizocarpon richardii | ||
| 7343 | Rhizocarpon ridescens | (Nyl.) Zahlbr. (1905) | Yes | Rhizocarpon ridescens | 2408 | NT NR Sc | Rhizocarpon ridescens | |||
| 7344 | Rhizocarpon riparium | Räsänen | No | Rhizocarpon geographicum | 1257 | LC | ||||
| 7345 | Rhizocarpon riparium subsp. lindsayanum | (Räsänen) Thomson | No | Rhizocarpon geographicum | 1257 | LC | ||||
| 7346 | Rhizocarpon riparium subsp. lindsayanum | No | 1273 | BLS number no longer used | ||||||
| 7347 | Rhizocarpon riparium subsp. riparium | No | 1272 | BLS number no longer used | ||||||
| 7348 | Rhizocarpon roridulum | (Th. Fr.) H. Olivier | No | incorrectly reported from the British Isles | ||||||
| 7349 | Rhizocarpon rubescens | auct. brit. pre-2020 | No | Rhizocarpon reductum | 1266 | LC | ||||
| 7350 | Rhizocarpon rubescens | Th. Fr. | Yes | Rhizocarpon rubescens | 1275 | NE NR |