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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 3901 | Lecidea calpodes | Stirt. | No | name of uncertain application (type lost) | ||||||
| 3902 | Lecidea caradocensis | Leight. ex Nyl. | No | Xylopsora caradocensis | 576 | LC | ||||
| 3903 | Lecidea carneoalbens | Nyl. (1876) | No | Micarea cinerea f. cinerea | 875 | LC | ||||
| 3904 | Lecidea carneoglauca | Nyl. (1873) | No | Aquacidia antricola | 139 | LC NS | ||||
| 3905 | Lecidea carneola | Ach. | No | Pachyphiale carneola | 972 | LC L | ||||
| 3906 | Lecidea carpathica | (Körb.) Szatala | No | Lecidella carpathica | 796 | LC | ||||
| 3907 | Lecidea carrollii | Coppins & P. James | No | Japewiella tavaresiana | 708 | LC | ||||
| 3908 | Lecidea cechumena | Ach. | No | Lecidea fuscoatra s. lat. | 724 | |||||
| 3909 | Lecidea cetrariicola | No | 1947 | BLS number no longer used | ||||||
| 3910 | Lecidea chalybeia | Borrer (1831) | No | Catillaria chalybeia | 306 | LC | ||||
| 3911 | Lecidea chalybeioides | Nyl. | No | Claurouxia chalybeioides | 1709 | LC NS | ||||
| 3912 | Lecidea chlorocarpa | Leight. | No | unidentified | F | |||||
| 3913 | Lecidea chloroscotina | Nyl. (1887) | No | Catillaria baliola | 1863 | NE NS | ||||
| 3914 | Lecidea chlorotiza | Nyl. (1866) | No | Lecania chlorotiza | 307 | NT NS P Eng Sc Wa IR | ||||
| 3915 | Lecidea cinerascens | sensu A.L. Sm., non Nyl. | No | Porpidia speirea | 774 | LC | ||||
| 3916 | Lecidea cinereorufa | Schaer. | No | Schaereria cinereorufa | 1311 | LC | ||||
| 3917 | Lecidea cinnabarina | No | 709 | BLS number no longer used | ||||||
| 3918 | Lecidea cinnabarina | Sommerf. | No | Pyrrhospora cinnabarina | Pyrrhospora cinnabarina (Sommerf.) M. Choisy, incorrectly reported from the British Isles | |||||
| 3919 | Lecidea cinnabarina | auct. brit. p.p. | No | Pertusaria pupillaris | 1091 | Pertusaria pupillaris and Schismatomma quercicola | LC | |||
| 3920 | Lecidea cinnabarina | auct. brit. p.p. | No | Schizotrema quercicola | 1585 | Pertusaria pupillaris and Schizotrema quercicola | LC Sc IR | |||
| 3921 | Lecidea circumpallens | Nyl. (1866) | No | Bacidina circumpallens | 2851 | |||||
| 3922 | Lecidea citrinella | (Ach.) Ach. | No | Arthrorhaphis citrinella | 100 | LC | ||||
| 3923 | Lecidea citrinella f. arenicola | auct. | No | Arthrorhaphis grisea | 313 | LC NS | LF | |||
| 3924 | Lecidea cladoniaria | Nyl. | No | Bachmanniomyces punctum | 1955 | LC NS | LF | |||
| 3925 | Lecidea clavulifera | Nyl. | No | Psilolechia clavulifera | 1199 | LC NS | ||||
| 3926 | Lecidea coarctata | (Sm.) Nyl. | No | Trapelia coarctata | 1431 | LC | ||||
| 3927 | Lecidea coarctata f. elacista | (Ach.) Th. Fr. | No | Trapelia elacista | 2710 | NE | ||||
| 3928 | Lecidea coarctata f. glebulosa | (Sm.) Leight. (1871) | No | Trapelia glebulosa s. str. | 2713 | LC | ||||
| 3929 | Lecidea coarctata f. microphyllina | (Fr.) Cromb. (1893) | No | Trapelia involuta s. str. | 2711 | LC | ||||
| 3930 | Lecidea coarctata var. glebulosa | (Sm.) Mudd (1861) | No | Trapelia glebulosa s. str. | 2713 | LC |