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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2251 | Cornutispora ciliata | Kalb (1993) | No | Spirographa ciliata | 2035 | NE NR | LF | |||
| 2252 | Cornutispora lichenicola | D. Hawksw. & B. Sutton (1976) | No | Spirographa lichenicola | 2036 | LC | LF | Cornutispora lichenicola | ||
| 2253 | Cornutispora pyramidalis | Etayo (2010) | No | Spirographa pyramidalis | 2764 | NE NR | LF | |||
| 2254 | Cornutispora triangularis | Diederich & Etayo (1995) | No | Spirographa triangularis | 2324 | NE NR | LF | |||
| 2255 | Cornutispora tricupulata | F. Berger & E. Zimm. (2018) | No | Spirographa tricupulata | 2800 | NE NR | LF | |||
| 2256 | Corticifraga fuckelii | (Rehm) D. Hawksw. & R. Sant. (1990) | Yes | Corticifraga fuckelii | Phragmonaevia fuckelii | 2037 | LC NS | LF | Corticifraga fuckelii | |
| 2257 | Corticifraga peltigerae | (Fuckel) D. Hawksw. & R. Sant. (1990) | Yes | Corticifraga peltigerae | Phragmonaevia peltigerae | 2038 | LC NS | LF | Corticifraga peltigerae | |
| 2258 | Corticiruptor abeloneae | (P.M. Jørg.) Wedin & Hafellner (1998) | Yes | Corticiruptor abeloneae | Arthonia abelonae | 1915 | NT NR | LF | Corticiruptor abeloneae | |
| 2259 | Corticium arachnoideum | Berk. | No | Athelia arachnoidea | 2015 | LC | LF | |||
| 2260 | Corticium centrifugum | sensu Bres. | No | Athelia arachnoidea | 2015 | LC | LF | |||
| 2261 | Courtoisia candelaris | (L.) L. Marchand | No | Chrysothrix candelaris | 354 | LC | ||||
| 2262 | Cresponea premnea | (Ach.) Egea & Torrente (1993) | Yes | Cresponea premnea | Lecanactis premnea Cresponea premnea var. saxicola Lecanactis plocina |
605 | LC Sc IR | Cresponea premnea | ||
| 2263 | Cresponea premnea var. saxicola | (Mudd) Egea & Torrente | No | Cresponea premnea | 605 | Cresponea premnea [on rock] | LC Sc IR | |||
| 2264 | Cresporhaphis wienkampii | (J. Lahm ex Hazsl.) M.B. Aguirre (1991) | No | Leptosillia wienkampii | 1284 | LC NR | Cresporhaphis wienkampii | |||
| 2265 | Cresporhapis ulmi | Calatayud & M.B. Aguirre (2001) | No | Leptosillia slaptonensis | 2869 | NE NR | F | |||
| 2266 | Crittendenia absistentis | Diederich, Coppins & Millanes (2022) | Yes | Crittendenia absistentis | 2815 | on Bacidia absistens | NE NR | LF | ||
| 2267 | Crittendenia coppinsii | (P. Roberts) Diederich, M. Westb., Millanes & Wedin (2021) | Yes | Crittendenia coppinsii | Chionosphaera coppinsii | 2031 | NE NR | LF | Crittendenia coppinsii | |
| 2268 | Crittendenia lecidellae | Diederich, Etayo & Millanes (2022) | Yes | Crittendenia lecidellae | 2816 | on Lecidella elaeochroma | NE NR | LF | ||
| 2269 | Crittendenia lichenicola | (Alstrup, B. Sutton & Tønsberg) Diederich, Millanes & Wedin (2021) | Yes | Crittendenia lichenicola | Chionosphaera lichenicola | 2425 | NE NR | LF | Crittendenia lichenicola | |
| 2270 | Crocodia aurata | (Ach.) Link (1833) | Yes | Crocodia aurata | Pseudocyphellaria aurata | 1194 | CR C2 NR P Eng IR | Crocodia aurata | ||
| 2271 | Crocynia aeruginosa | auct. brit. p.p. | No | Botryolepraria lesdainii | 1628 | LC | ||||
| 2272 | Crocynia aeruginosa | auct. brit. p.p. | No | Lepraria incana | 820 | |||||
| 2273 | Crocynia andrewii | B. de Lesd. | No | Lepraria finkii | 1629 | LC | ||||
| 2274 | Crocynia anglica | B. de Lesd. ex Hue | No | application uncertain (type lost) | ||||||
| 2275 | Crocynia caesioalba | B. de Lesd. | No | Lepraria caesioalba | 823 | LC | ||||
| 2276 | Crocynia crassissima | Hue | No | Lepraria crassissima | 819 | LC NR | ||||
| 2277 | Crocynia crassissima | auct. brit. p.max.p. | No | Lepraria nivalis | 1714 | LC NS | ||||
| 2278 | Crocynia creticola | Hue (1924) | No | application uncertain | ||||||
| 2279 | Crocynia declivicola | Hue (1924) | No | application uncertain | ||||||
| 2280 | Crocynia finkii | B. de Lesd. | No | Lepraria finkii | 1629 | LC |