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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 6631 | Placodium luteoalbum | (Turner) Anzi (1860) | No | Cerothallia luteoalba | 266 | EN A2, C1 NS P Eng Sc Wa S8 | ||||
| 6632 | Placodium medians | Nyl. | No | Candelariella medians f. medians | 296 | LC | ||||
| 6633 | Placodium microphyllum | sensu Hook. | No | Parmeliella thriptophylla | 1032 | LC Sc L IR | ||||
| 6634 | Placodium microthallinum | (Wedd.) H. Olivier (1897) | No | Flavoplaca microthallina | 268 | LC | ||||
| 6635 | Placodium miniatulum | (Nyl.) H. Olivier (1909) | No | Calogaya oblitterata | 236 | LC | ||||
| 6636 | Placodium murorum | sensu auct. brit. | No | Calogaya pusilla | 277 | LC | ||||
| 6637 | Placodium murorum f. arnoldii | auct. brit. | No | Calogaya oblitterata | 236 | LC | ||||
| 6638 | Placodium murorum f. corticola | (Nyl.) Boistel (1896) | No | Calogaya pusilla | 277 | LC | ||||
| 6639 | Placodium murorum var. miniatum | sensu auct. brit. | No | Calogaya oblitterata | 236 | LC | ||||
| 6640 | Placodium murorum var. pusillum | auct. brit. p.p. | No | Calogaya oblitterata | 236 | LC | ||||
| 6641 | Placodium murorum var. pusillum | auct. brit. p.p. | No | Calogaya pusilla | 277 | LC | ||||
| 6642 | Placodium nivale | (Körb.) Tuck. (1882) | No | Caloplaca nivalis | 269 | CR B, D NR S Sc S8 | ||||
| 6643 | Placodium obliterans | Nyl. (1874) | No | Leproplaca obliterans | 270 | LC NS | ||||
| 6644 | Placodium ochraceum | (Schaer.) Anzi (1860) | No | Xanthocarpia ochracea | 272 | LC NS Sc | ||||
| 6645 | Placodium phaeocarpellum | (Nyl.) A.L. Sm. (1918) | No | Huneckii pollinii | 274 | Synonymy and British status needs further study | Ex | |||
| 6646 | Placodium phloginum | (Ach.) A.L. Sm. (1918) | No | Scythioria phlogina | 2317 | NE ?NS | ||||
| 6647 | Placodium plumbeum | (Lightf.) Hook. | No | Degelia plumbea | 1029 | LC L IR | ||||
| 6648 | Placodium pollinii | (A. Massal.) A.L. Sm. (1918) | No | Huneckia pollinii | 274 | Ex | ||||
| 6649 | Placodium pusillum | sensu auct. brit. | No | Calogaya oblitterata | 236 | LC | ||||
| 6650 | Placodium pusillum | sensu auct. brit. p.p. | No | Calogaya pusilla | 277 | LC | ||||
| 6651 | Placodium pyraceum | auct. p.p., non (Ach.) Anzi | No | Athallia holocarpa s. lat. | 261 | name or specific epithet valid but has been misused in the past | LC | |||
| 6652 | Placodium pyraceum | auct. p.p., non (Ach.) Anzi | No | Flavoplaca oasis | 2461 | name or specific epithet valid but has been misused in the past | LC | |||
| 6653 | Placodium pyraceum f. pictum | (Taylor) A.L. Sm. (1918) | No | Athallia holocarpa s. lat. | 261 | LC | ||||
| 6654 | Placodium pyraceum var. holocarpum | (Hoffm.) Anzi (1868) | No | Athallia holocarpa s. lat. | 261 | LC | ||||
| 6655 | Placodium pyraceum var. lacteum | auct. brit. non (A. Massal.) A.L. Sm. | No | Xanthocarpia fulva | 264 | LC | ||||
| 6656 | Placodium pyraceum var. pyrithromum | (Ach.) A.L. Sm. (1918) | No | Athallia holocarpa s. lat. | 261 | LC | ||||
| 6657 | Placodium refellens | (Nyl.) A.L. Sm. | No | Caloplaca obscurella | 271 | LC | ||||
| 6658 | Placodium rupestre | (Scop.) Branth & Rostr. | No | Protoblastenia rupestris | 1189 | LC | ||||
| 6659 | Placodium rupestre f. incrustans | (DC.) A.L. Sm. | No | Protoblastenia incrustans | 1188 | LC | ||||
| 6660 | Placodium rupestre var. calvum | (Dicks.) A.L. Sm. | No | Protoblastenia calva | 1186 | LC |