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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1501 | Caloplaca murorum f. pusilla | auct. brit. | No | Calogaya pusilla | 277 | LC | ||||
| 1502 | Caloplaca neotaurica | Vondrák, Khodosovtsev, Arup & Søchting (2012) | No | Kuettlingeria neotaurica | 2595 | NE | ||||
| 1503 | Caloplaca nivalis | (Körb.) Th. Fr. (1871) | Yes | Caloplaca nivalis | Lendemeriella nivalis | 269 | CR B, D NR S Sc S8 | Caloplaca nivalis | ||
| 1504 | Caloplaca oasis | (A. Massal.) Szatala (1932) | No | Flavoplaca oasis | 2461 | LC | ||||
| 1505 | Caloplaca obliterans | (Nyl.) Blomb. & Forssell (1880) | No | Leproplaca obliterans | 270 | LC NS | ||||
| 1506 | Caloplaca obliterascens | (Nyl.) Zahlbr. (1931) | No | Calogaya oblitterata | 236 | LC | ||||
| 1507 | Caloplaca obscurella | (J. Lahm) Th. Fr. (1871) | Yes | Caloplaca obscurella | Caloplaca sarcopisioides; Caloplaca sarcopidoides | 271 | LC | Caloplaca obscurella | ||
| 1508 | Caloplaca ochracea | (Schaer.) Flagey (1886) | No | Xanthocarpia ochracea | 272 | LC NS Sc | ||||
| 1509 | Caloplaca phaeocarpella | (Nyl.) Zahlbr. | No | Huneckia pollinii | 274 | Synonymy and British status needs further study | Ex | |||
| 1510 | Caloplaca phlogina | (Ach.) Flagey (1886) | No | Scythioria phlogina | 2317 | NE ?NS | ||||
| 1511 | Caloplaca pollinii | (A. Massal.) Jatta (1900) | No | Huneckia pollinii | 274 | Ex | ||||
| 1512 | Caloplaca polycarpa | auct. brit. | No | Flavoplaca oasis | 2461 | LC | ||||
| 1513 | Caloplaca polycarpa | (A. Massal.) Zahlbr. (1919) | No | Caloplaca polycarpa | incorrectly reported from the British Isles | |||||
| 1514 | Caloplaca pusilla | auct. brit. | No | Calogaya pusilla | 277 | LC | ||||
| 1515 | Caloplaca pyracea | auct. brit. p.p. | No | Athallia holocarpa s. lat. | 261 | name or specific epithet valid but has been misused in the past | LC | |||
| 1516 | Caloplaca pyracea | auct. brit. p.p. | No | Flavoplaca oasis | 2461 | name or specific epithet valid but has been misused in the past | LC | |||
| 1517 | Caloplaca pyracea | (Ach.) Zwackh (1862) | No | Athallia pyracea | 2528 | LC ?NS | ||||
| 1518 | Caloplaca pyracea var. pyrithroma | (Ach.) Flagey (1888) | No | Athallia holocarpa s. lat. | 261 | LC | ||||
| 1519 | Caloplaca ruderum | (Malbr.) J.R. Laundon (1976) | No | Flavoplaca ruderum | 275 | LC | ||||
| 1520 | Caloplaca sarcopidoides | (Körb.) Zahlbr. (1910) | No | Caloplaca obscurella | 271 | LC | ||||
| 1521 | Caloplaca sarcopisioides | (Körb.) Zahlbr. (1901) [orth. error] | No | Caloplaca obscurella | 271 | orth. error | LC | |||
| 1522 | Caloplaca sarcopisoides | (Körb.) Zahlbr. (1910) [orth. error] | No | Caloplaca obscurella | 271 | orth. error | LC | |||
| 1523 | Caloplaca saxicola | sensu auct. brit. | No | Calogaya pusilla | 277 | the true identity of C. saxicola is unclear | LC | |||
| 1524 | Caloplaca schaereri | sensu auct. brit. | No | Flavoplaca itiana | 285 | LC | ||||
| 1525 | Caloplaca scopularis | (Nyl.) Lettau (1912) | No | Athallia scopularis | 278 | NT NS | ||||
| 1526 | Caloplaca sol | Orange (2018) | No | Flavoplaca sol | 2707 | NE NR | ||||
| 1527 | Caloplaca soralifera | Vondrák & Hrouzek (2006) | No | Kuettlingeria soralifera | 2460 | DD NR | ||||
| 1528 | Caloplaca sorediella | Arup (2006) | No | Haloplaca sorediella | 2459 | LC NR | ||||
| 1529 | Caloplaca sterilis | Šoun, Khodos. & Vondrák (2011) | Yes | Caloplaca sterilis | 2914 | NE NR | Caloplaca sterilis | |||
| 1530 | Caloplaca stillicidiorum | (Vahl) Lynge (1921) | Yes | Caloplaca stillicidiorum | 1991 | LC NS | Caloplaca stillicidiorum |