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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1261 | Byssoloma leucoblepharum | (Nyl.) Vain. (1926) | Yes | Byssoloma leucoblepharum | 1858 | Most if not all British records are referable to B. maderense | NT NR | Byssoloma leucoblepharum | ||
| 1262 | Byssoloma llimonae | Sérus., Gómex-Bolea, Longán & Lücking (2002) | Yes | Byssoloma llimonae | Fellhanera christiansenii auct. brit. | 2472 | NE NR | Byssoloma llimonae | ||
| 1263 | Byssoloma maderense | Breuss (2014) | Yes | Byssoloma maderense | Byssoloma leucoblepharum auct. p.p. | 2791 | Most British records of B. leucoblepharum probably belong here | NE NR | Byssoloma maderense | |
| 1264 | Byssoloma marginatum | (Arnold) Sérus. (1992) | Yes | Byssoloma marginatum | 1557 | LC NS | Byssoloma marginatum | |||
| 1265 | Byssoloma rotuliforme | (Müll. Arg.) R. Sant.. (1952) | No | Byssoloma subdiscordans | 221 | NT NR | ||||
| 1266 | Byssoloma subdiscordans | (Nyl.) P. James (1971) | Yes | Byssoloma subdiscordans | Byssoloma rotuliforme | 221 | NT NR | Byssoloma subdiscordans | ||
| 1267 | Byssus botryoides | L. (1753) | No | Lichenomphalia ericetorum | 931 | LC | ||||
| 1268 | Byssus candelaris | L. (1753) | No | Chrysothrix candelaris | 354 | LC | ||||
| 1269 | Byssus incana | L. (1753) | No | Lepraria incana | 820 | |||||
| 1270 | Caelochroma atomarioides | (Müll. Arg.) M. Svenss., S. Ekman & M. Westb. | No | Catillaria atomarioides | 1609 | LC NS | ||||
| 1271 | Caeruleum heppii | (Nägeli ex Körb.) K. Knudsen & Arcadia (2012) | Yes | Caeruleum heppii | Acarospora heppii; Myriospora heppii | 13 | LC NS | Caeruleum heppii | ||
| 1272 | Calicium abietinum | Pers. (1797) | Yes | Calicium abietinum | 222 | Most records refer to C. glaucellum | DD ? | Calicium abietinum | ||
| 1273 | Calicium abietinum | No | 1980 | BLS number no longer used | ||||||
| 1274 | Calicium abietinum auct. brit. p.p. | auct. brit. p.p. | No | Calicium glaucellum | 225 | name or specific epithet valid but has been misused in the past | LC | |||
| 1275 | Calicium aciculare | auct. brit., | No | Chaenotheca hispidula | 345 | LC NS | ||||
| 1276 | Calicium adspersum | Pers. (1798) | Yes | Calicium adspersum | Calicium roscidum | 223 | CR D NR P Eng Wa | Calicium adspersum | ||
| 1277 | Calicium aeruginosum | auct. p.p. | No | Chaenotheca stemonea | 348 | LC NS | ||||
| 1278 | Calicium aeruginosum | Turner ex Sm. | No | Chaenotheca trichialis | 349 | LC | ||||
| 1279 | Calicium aeruginosum subsp. caerulescens | Turner & Borrer | No | Chaenotheca trichialis | 349 | LC | ||||
| 1280 | Calicium amylocaule | Lettau | No | Calicium lenticulare | 229 | LC NS Sc IR | ||||
| 1281 | Calicium arenarium | (Hampe ex A. Massal.) Hampe ex Körb. | No | Microcalicium arenarium | 1951 | LC NR | LF | |||
| 1282 | Calicium brunneolum | Ach. (1816) | No | Chaenotheca brunneola | 341 | LC | ||||
| 1283 | Calicium byssaceum | Fr. (1831) | No | Stenocybe pullatula | 1563 | LC | F | |||
| 1284 | Calicium cantherellum | sensu Sm. | No | Sclerophora pallida | 468 | VU C2, D1 NS P Eng Sc | ||||
| 1285 | Calicium chlorellum | auct. brit., non Ach. | No | Chaenotheca hispidula | 345 | LC NS | ||||
| 1286 | Calicium chrysocephalum | Ach. (1803) | No | Chaenotheca chrysocephala | 343 | LC | ||||
| 1287 | Calicium chrysocephalum f. filare | (Ach.) Cromb. | No | Chaenotheca chrysocephala | 343 | LC | ||||
| 1288 | Calicium chrysocephalum f. melanocephalum | Nyl. | No | Chaenotheca chrysocephala | 343 | LC | ||||
| 1289 | Calicium citrinum | (Leight.) Nyl. | No | Microcalicium arenarium | 1951 | LC NR | LF | |||
| 1290 | Calicium clavellum | auct. brit. | No | Calicium quercinum | 227 | Ex |