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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 6601 | Placodium cerinum f. cyanopolium | (Nyl.) A.L. Sm. | No | Caloplaca chlorina | 263 | LC | ||||
| 6602 | Placodium cerinum var. chlorina | (Flot.) Körb. | No | Caloplaca chlorina | 263 | LC | ||||
| 6603 | Placodium cerinum var. stilicidiorum | (Vahl) Hepp [orth. error] | No | Caloplaca stillicidiorum | 1991 | LC NS | ||||
| 6604 | Placodium cerinum var. stillicidiorum | (Vahl) Hepp (1857) | No | Caloplaca stillicidiorum | 1991 | LC NS | ||||
| 6605 | Placodium chalybaeum | (Fr.) Nägeli ex Hepp (1853) | No | Pyrenodesmia chalybaea | 243 | LC NS | ||||
| 6606 | Placodium cirrochroum | (Ach.) Rabenh. (1856) | No | Leproplaca cirrochroa | 246 | LC | ||||
| 6607 | Placodium cirrochroum var. obliterans | (Nyl.) A.L. Sm. (1918) | No | Leproplaca obliterans | 270 | LC NS | ||||
| 6608 | Placodium citrinum | (Hoffm.) Hepp (1857), sensu auct. brit. | No | Flavoplaca citrina s. lat. | 247 | LC | ||||
| 6609 | Placodium concilians | (Nyl.) A.L. Sm. | No | Caloplaca concilians | 248 | DD NR Sc | ||||
| 6610 | Placodium crenulatellum | (Nyl.) A.L. Sm. (1918) | No | Xanthocarpia crenulatella | 249 | LC | ||||
| 6611 | Placodium daedaleum | (Sm.) Hook. | No | Pyxine sorediata | Pyxine sorediata (Ach.) Mont., incorrectly reported from the British Isles | |||||
| 6612 | Placodium decipiens | (Arnold) Leight. (1871) | No | Calogaya decipiens | 250 | LC | ||||
| 6613 | Placodium dissidens | Nyl. (1875) | No | Rusavskia elegans | 1528 | LC | ||||
| 6614 | Placodium elegans | (Link) DC. (1805) | No | Rusavskia elegans | 1528 | LC | ||||
| 6615 | Placodium erythrocarpum | auct. brit. | No | Kuettlingeria teicholyta | 281 | LC | ||||
| 6616 | Placodium ferrugineum | auct. p.p. (saxicolous) | No | Bastenia crenularia | 253 | LC | ||||
| 6617 | Placodium ferrugineum | (Huds.) Hepp (1870) | No | Blastenia ferruginea s. lat. | 2280 | |||||
| 6618 | Placodium ferrugineum f. ferruginascens | (Nyl.) A.L. Sm. (1918) | No | Rufoplaca arenaria | 235 | LC NS | ||||
| 6619 | Placodium ferrugineum var. festivum | (Ach.) A.L. Sm. (1918) | No | Blastenia crenularia | 253 | LC | ||||
| 6620 | Placodium flavescens | (Huds.) A.L. Sm. (1918) | No | Variospora flavescens | 259 | LC | ||||
| 6621 | Placodium fulgens | (Sw.) DC. (1805) | No | Gyalolechia fulgens | 513 | EN B1+2 NR P Eng Wa | ||||
| 6622 | Placodium fuscoatrum | (Nyl.) A.L. Sm. (1918) | No | Sanguineodiscus aractinus | 234 | VU D2 NR P Eng | ||||
| 6623 | Placodium granulosum | (Müll. Arg.) Hepp (1867) | No | Flavoplaca granulosa | 257 | NT NR | ||||
| 6624 | Placodium granulosum | auct. p.p. | No | Polycauliona verruculifera | 286 | LC | ||||
| 6625 | Placodium haematites | (Chaub. ex St.-Amans) Anzi (1862) | No | Sanguineodiscus haematites | 258 | DD NR | ||||
| 6626 | Placodium incrustans | (DC.) A.L. Sm. | No | Protoblastenia incrustans | 1188 | LC | ||||
| 6627 | Placodium lallavei | auct. brit. p.p., non (Clemente ex Ach.) Anzi | No | Kuettlingeria albolutescens | 2503 | some records may be Caloplaca teicholyta | LC NS | |||
| 6628 | Placodium lallavei | Clemente ex Ach.) Anzi (1862) | No | Kuettlingeria teicholyta | 281 | LC | ||||
| 6629 | Placodium lobulatum | auct. brit. | No | Flavoplaca marina | 267 | LC | ||||
| 6630 | Placodium luteoalbum | (Turner) Anzi (1860) | No | Cerothallia luteoalba | 266 | EN A2, C1 NS P Eng Sc Wa S8 |