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 caesiorufum | auct. | No | Kuettlingeria ceracea | 1644 | LC | ||||
| 6632 | Placodium callopismum | (Ach.) Mérat (1821) | No | Variospora aurantia | 239 | LC | ||||
| 6633 | Placodium callopismum f. thallincolum | (Wedd.) Walt. Watson (1930) | No | Variospora thallincola | 282 | LC | ||||
| 6634 | Placodium callopismum var. brevilobatum | (Nyl.) A.L. Sm. (1918) | No | Variospora flavescens | 259 | LC | ||||
| 6635 | Placodium callopismum var. plicatum | (Wedd.) Leight. (1871) | No | Variospora flavescens | 259 | LC | ||||
| 6636 | Placodium canescens | (Dicks.) DC. (1805) | Diploicia canescens | 491 | LC | |||||
| 6637 | Placodium cerinellum | (Nyl.) Vain. (1899) | No | Athallia cerinella | 242 | LC | ||||
| 6638 | Placodium cerinum | (Hedw.) Nägeli ex Hepp (1853) | No | Caloplaca cerina | 241 | LC | ||||
| 6639 | Placodium cerinum f. cyanopolium | (Nyl.) A.L. Sm. | No | Caloplaca chlorina | 263 | LC | ||||
| 6640 | Placodium cerinum var. chlorina | (Flot.) Körb. | No | Caloplaca chlorina | 263 | LC | ||||
| 6641 | Placodium cerinum var. stilicidiorum | (Vahl) Hepp [orth. error] | No | Caloplaca stillicidiorum | 1991 | LC NS | ||||
| 6642 | Placodium cerinum var. stillicidiorum | (Vahl) Hepp (1857) | No | Caloplaca stillicidiorum | 1991 | LC NS | ||||
| 6643 | Placodium chalybaeum | (Fr.) Nägeli ex Hepp (1853) | No | Pyrenodesmia chalybaea | 243 | LC NS | ||||
| 6644 | Placodium cirrochroum | (Ach.) Rabenh. (1856) | No | Leproplaca cirrochroa | 246 | LC | ||||
| 6645 | Placodium cirrochroum var. obliterans | (Nyl.) A.L. Sm. (1918) | No | Leproplaca obliterans | 270 | LC NS | ||||
| 6646 | Placodium citrinum | (Hoffm.) Hepp (1857), sensu auct. brit. | No | Flavoplaca citrina s. lat. | 247 | LC | ||||
| 6647 | Placodium concilians | (Nyl.) A.L. Sm. | No | Caloplaca concilians | 248 | DD NR Sc | ||||
| 6648 | Placodium crenulatellum | (Nyl.) A.L. Sm. (1918) | No | Xanthocarpia crenulatella | 249 | LC | ||||
| 6649 | Placodium daedaleum | (Sm.) Hook. | No | Pyxine sorediata | Pyxine sorediata (Ach.) Mont., incorrectly reported from the British Isles | |||||
| 6650 | Placodium decipiens | (Arnold) Leight. (1871) | No | Calogaya decipiens | 250 | LC | ||||
| 6651 | Placodium dissidens | Nyl. (1875) | No | Rusavskia elegans | 1528 | LC | ||||
| 6652 | Placodium elegans | (Link) DC. (1805) | No | Rusavskia elegans | 1528 | LC | ||||
| 6653 | Placodium erythrocarpum | auct. brit. | No | Kuettlingeria teicholyta | 281 | LC | ||||
| 6654 | Placodium ferrugineum | auct. p.p. (saxicolous) | No | Bastenia crenularia | 253 | LC | ||||
| 6655 | Placodium ferrugineum | (Huds.) Hepp (1870) | No | Blastenia ferruginea s. lat. | 2280 | |||||
| 6656 | Placodium ferrugineum f. ferruginascens | (Nyl.) A.L. Sm. (1918) | No | Rufoplaca arenaria | 235 | LC NS | ||||
| 6657 | Placodium ferrugineum var. festivum | (Ach.) A.L. Sm. (1918) | No | Blastenia crenularia | 253 | LC | ||||
| 6658 | Placodium flavescens | (Huds.) A.L. Sm. (1918) | No | Variospora flavescens | 259 | LC | ||||
| 6659 | Placodium fulgens | (Sw.) DC. (1805) | No | Gyalolechia fulgens | 513 | EN B1+2 NR P Eng Wa | ||||
| 6660 | Placodium fuscoatrum | (Nyl.) A.L. Sm. (1918) | No | Sanguineodiscus aractinus | 234 | VU D2 NR P Eng |