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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 3991 | Lecidea declinascens | Nyl. | No | Lecidea lapicida | 738 | LC | ||||
| 3992 | Lecidea decolorans | (Hoffm.) Flörke (1809) | No | Trapeliopsis granulosa | 727 | LC | ||||
| 3993 | Lecidea decolorans subsp. flexuosa | (Fr.) Cromb. | No | Trapeliopsis flexuosa | 692 | LC | ||||
| 3994 | Lecidea decolorans var. flexuosa | (Fr.) Link | No | Trapeliopsis flexuosa | 692 | LC | ||||
| 3995 | Lecidea deducta | Nyl. | No | unidentified | F | |||||
| 3996 | Lecidea delimis | Nyl. | No | Paralecanographa grumulosa | 597 | LC NS | ||||
| 3997 | Lecidea deludens | Nyl. | No | Rhizocarpon alpicola | 1245 | LC NS | ||||
| 3998 | Lecidea demarginata | Nyl., (1878) non auct. brit. | No | Leimonis erratica | 719 | LC | ||||
| 3999 | Lecidea demarginata | auct. brit. | No | Brianaria lutulata | 882 | LC | ||||
| 4000 | Lecidea demissa | (Rutstr.) Ach. (1803) | No | Lecidoma demissum | 806 | LC NS | ||||
| 4001 | Lecidea demolita | auct. brit., non Vain. | No | Lecidea lactea s. lat. | 737 | LC | ||||
| 4002 | Lecidea denigrata | (Fr.) Nyl. | No | Micarea denigrata | 877 | LC | ||||
| 4003 | Lecidea denigrata subsp. subnigrata | (Nyl.) Cromb. | No | Micarea subnigrata | 891 | LC NS | ||||
| 4004 | Lecidea deparcula | Nyl. | No | Cecidonia xenophana | 1838 | LC NS | LF | |||
| 4005 | Lecidea dicksonii | auct. | No | Tremolecia atrata | 1438 | LC | ||||
| 4006 | Lecidea diducens | Nyl. (1865) | Yes | Lecidea diducens | Lecidea auriculata var. diducens | 715 | LC NS | Lecidea diducens | ||
| 4007 | Lecidea didymospora | Stirt. | No | Mycoblastus sp. | Mycoblastus affinis or M. sanguinarius f. sanguinarius | |||||
| 4008 | Lecidea diluta | (Pers.) Leight. (1879) | Coenogonium pineti | 489 | LC | |||||
| 4009 | Lecidea diluta f. leucostigma | Leight. (1879) | No | Coenogonium pineti | 489 | LC | ||||
| 4010 | Lecidea discolorella | Nyl. | No | Miriquidica leucophaea | 739 | LC | ||||
| 4011 | Lecidea dispansa | Nyl. (1866) | No | Leimonis erratica | 719 | LC | ||||
| 4012 | Lecidea doliiformis | Coppins & P. James | No | Micarea doliiformis | 1698 | LC NS | ||||
| 4013 | Lecidea dolosa | auct. brit. | No | Lecidella elaeochroma f. elaeochroma | 797 | LC | ||||
| 4014 | Lecidea dubia | Turner & Borrer (1833), non Schaer. (1828) | No | Lecidella pulveracea | 801 | Ex | ||||
| 4015 | Lecidea dubiosa | Zahlbr. | No | Lecidella pulveracea | 801 | Ex | ||||
| 4016 | Lecidea dufourii | Ach. ex Nyl. (1873) | No | Gilbertaria contristans | 309 | as "dufourei" | LC NS | |||
| 4017 | Lecidea ecrustacea | (Anzi ex Arnold) Arnold | No | incorrectly reported from the British Isles | ||||||
| 4018 | Lecidea efflorescens | (Hedl.) Erichsen | No | Biatora efflorescens | 718 | NT NR Sc | ||||
| 4019 | Lecidea effusa | auct. brit. p.p. | No | Bacidia sp. | various Bacidia spp. with pale apothecia | |||||
| 4020 | Lecidea effusa | auct. brit. p.p. | No | Lecania cyrtellina | 614 | LC |