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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 4801 | Lichen corneus | With. (1776) | No | Umbilicaria cylindrica | 1446 | LC | ||||
| 4802 | Lichen cornigerus | With. | No | Cladonia subulata | 422 | LC | ||||
| 4803 | Lichen cornucopioides | auct. brit. p.p. | No | Cladonia verticillata | 370 | LC | ||||
| 4804 | Lichen cornucopioides | auct. brit. p.p. | No | Cladonia coccifera s. lat. | 374 | |||||
| 4805 | Lichen cornutus | L. | No | Cladonia cornuta | 378 | LC | ||||
| 4806 | Lichen corrugatus | Sm. | No | Pleurosticta acetabulum | 982 | LC | ||||
| 4807 | Lichen corynellus | Ach. | No | Calicium corynellum | 224 | CR A, B, D NR P Eng Sc | ||||
| 4808 | Lichen crassus | Huds. | No | Squamarina cartilaginea | 1337 | LC | ||||
| 4809 | Lichen crenularius | With. (1776) | No | Blastenia crenularia | 253 | LC | ||||
| 4810 | Lichen crenulatus | Dicks., non With. | No | Myriolecis crenulata | 644 | LC | ||||
| 4811 | Lichen crenulatus | With. | No | Pannaria rubiginosa | 980 | LC Sc L IR | ||||
| 4812 | Lichen cretaceus | Sm. (1800) | No | Scytinium biatorinum | 827 | ? Leptogium biatorinum | LC NS Sc | |||
| 4813 | Lichen crinitus | Lightf. | No | Umbilicaria cylindrica | 1446 | LC | ||||
| 4814 | Lichen crispus | Huds. (1762) | No | Blennothallia crispa | 440 | LC | ||||
| 4815 | Lichen cristatus | L. (1753) | No | Lathagrium cristatum | 442 | LC | ||||
| 4816 | Lichen cristatus | sensu Huds. et sensu Sm. | No | Enchylium tenax var. tenax | 459 | LC | ||||
| 4817 | Lichen crocatus | auct. brit. | No | Pseudocyphellaria citrina | 1195 | LC Sc IR | ||||
| 4818 | Lichen croceus | L. | No | Solorina crocea | 1329 | LC NS | ||||
| 4819 | Lichen cycloselis | Ach. | No | Phaeophyscia orbicularis | 1107 | LC | ||||
| 4820 | Lichen cylindricus | L. | No | Umbilicaria cylindrica | 1446 | LC | ||||
| 4821 | Lichen daedaleus | Sm. | No | Pyxine sorediata | Pyxine sorediata (Ach.) Mont., incorrectly reported from the British Isles | |||||
| 4822 | Lichen debilis | Sm. | No | Chaenothecopsis debilis | 778 | Ex | F | |||
| 4823 | Lichen deustus | L. | No | Umbilicaria deusta | 1447 | LC NS | ||||
| 4824 | Lichen deustus | Lightf., non L. | No | Umbilicaria proboscidea | 1453 | LC | ||||
| 4825 | Lichen didactylos | With. [orth. var.] | No | Peltigera didactyla | 1053 | LC | ||||
| 4826 | Lichen didactylus | With. | No | Peltigera didactyla | 1053 | LC | ||||
| 4827 | Lichen digitatus | L. | No | Cladonia digitata | 383 | LC | ||||
| 4828 | Lichen dillenii | With. | No | Umbilicaria grisea | 1448 | |||||
| 4829 | Lichen distortus | With. (1776) | No | Physconia distorta | 1130 | LC | ||||
| 4830 | Lichen dolosus | sensu Sm. (1814) | No | identity uncertain |