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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2041 | Cliostomum subtenerum | Coppins & Fryday (2012) | Yes | Cliostomum subtenerum | 2573 | Cliostomum subtenerum | ||||
| 2042 | Cliostomum tenerum | (Nyl.) Coppins & S. Ekman (1997) | Yes | Cliostomum tenerum | Lecania tenera Lecanora tenera |
689 | LC | Cliostomum tenerum | ||
| 2043 | Clypeococcum cladonema | (Wedd.) D. Hawksw. (1977) | Yes | Clypeococcum cladonema | 2032 | NE NR | LF | Clypeococcum cladonema | ||
| 2044 | Clypeococcum epicrassum | (H. Olivier) Nav.-Ros. & Cl. Roux | No | Clypeococcum psoromatis | 2033 | NE NR | LF | |||
| 2045 | Clypeococcum hemiamyloideum | Shivarov (2019) | Yes | Clypeococcum hemiamyloideum | 2754 | On Verrucaria anziana | NE NR | LF | ||
| 2046 | Clypeococcum hypocenomyceae | D. Hawksw. [orth. error] | No | Clypeococcum hypocenomycis | 2034 | LC | LF | |||
| 2047 | Clypeococcum hypocenomycis | D. Hawksw. (1980) | Yes | Clypeococcum hypocenomycis | Clypeococcum hypocenomyceae | 2034 | LC | LF | Clypeococcum hypocenomycis | |
| 2048 | Clypeococcum psoromatis | (A. Massal.) Etayo (2010) | Yes | Clypeococcum psoromatis | Clypeococcum epicrassum | 2033 | NE NR | LF | Clypeococcum psoromatis | |
| 2049 | Coccotrema citrinescens | P. James & Coppins (1992) | Yes | Coccotrema citrinescens | 1699 | LC NS | Coccotrema citrinescens | |||
| 2050 | Coelocaulon aculeatum | (Schreb.) Link | No | Cetraria aculeata | 430 | LC | ||||
| 2051 | Coelocaulon aculeatum f. sorediatum | (Du Rietz) D. Hawksw. | No | Taeniolella rolfii | 2327 | Cetraria aculeata parasitized by Taeniolella rolfii {LF} | NE NR | |||
| 2052 | Coelocaulon aculeatum subsp. hispidum | (Cromb.) D. Hawksw. | No | Cetraria muricata | 431 | LC | ||||
| 2053 | Coelocaulon divergens | (Ach.) R. Howe | No | Bryocaulon divergens | Bryocaulon divergens (Ach.) Kärnefelt, incorrectly reported from the British Isles; the no. 432 was given to this taxon | |||||
| 2054 | Coelocaulon muricatum | (Ach.) J.R. Laundon (1984) | No | Cetraria muricata | 431 | LC | ||||
| 2055 | Coenogonium confusum | Malíček & Sanderson in ed. | No | Coenogonium nimisii | 2787 | NE NS | ||||
| 2056 | Coenogonium ebeneum | (Dillwyn) A.L. Sm. | No | Cystocoleus ebeneus | 477 | LC | ||||
| 2057 | Coenogonium luteum | (Dicks.) Kalb & Lücking (2000) | Yes | Coenogonium luteum | Dimerella lutea | 490 | LC L* | Coenogonium luteum | ||
| 2058 | Coenogonium nigrum | auct. | No | Cystocoleus ebeneus | 477 | LC | ||||
| 2059 | Coenogonium nimisii | Malíček & Sanderson (2023) | Yes | Coenogonium nimisii | Coenogonium confusum in ed. | 2787 | NE NS | Coenogonium nimisii | ||
| 2060 | Coenogonium pineti | (Ach.) Lücking & Lumbsch (2004) | Yes | Coenogonium pineti | Dimerella diluta; Dimerella pineti | 489 | LC | Coenogonium pineti | ||
| 2061 | Coenogonium tavaresianum | (Vězda) Lücking, Aptroot & Sipman (2006) | Yes | Coenogonium tavaresianum | Dimerella tavaresiana | 2695 | NE NR | Coenogonium tavaresianum | ||
| 2062 | Collema aggregatum | auct. | No | Gabura fascicularis | 444 | NT NS P Sc WaL IR | ||||
| 2063 | Collema auriculatum | Hoffm. (1796) | No | Lathagrium auriforme | 433 | LC | ||||
| 2064 | Collema auriculatum f. membranaceum | (Kremp.) Leight. (1879) | No | Lathagium auriforme | 433 | LC | ||||
| 2065 | Collema auriculatum var. pinguescens | Nyl. ex Cromb. | No | Lathagrium cristatum | 442 | LC | ||||
| 2066 | Collema auriforme | (With.) Coppins & J.R. Laundon (1984) | No | Lathagrium auriforme | 433 | LC | ||||
| 2067 | Collema bachmanianum | (Fink) Degel. (1954) | No | Enchylium bachmanianum | 434 | NT NS Sc IR | ||||
| 2068 | Collema callopismum var. callopismum | A. Massal. (1856) | No | Scytinium callopismum | 435 | DD NR | ||||
| 2069 | Collema callopismum var. rhyparodes | (Nyl.) Degel. (1954) | No | Scytinium callopismum var. rhyparodes | 436 | DD NR Sc | ||||
| 2070 | Collema ceraniscum | Nyl. (1865) | No | Rostania ceranisca | 437 | VU D1, D2 NR Sc |