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 deparcula | Nyl. | No | Cecidonia xenophana | 1838 | LC NS | LF | |||
| 3992 | Lecidea dicksonii | auct. | No | Tremolecia atrata | 1438 | LC | ||||
| 3993 | Lecidea diducens | Nyl. (1865) | Yes | Lecidea diducens | Lecidea auriculata var. diducens | 715 | LC NS | Lecidea diducens | ||
| 3994 | Lecidea didymospora | Stirt. | No | Mycoblastus sp. | Mycoblastus affinis or M. sanguinarius f. sanguinarius | |||||
| 3995 | Lecidea diluta | (Pers.) Leight. (1879) | Coenogonium pineti | 489 | LC | |||||
| 3996 | Lecidea diluta f. leucostigma | Leight. (1879) | No | Coenogonium pineti | 489 | LC | ||||
| 3997 | Lecidea discolorella | Nyl. | No | Miriquidica leucophaea | 739 | LC | ||||
| 3998 | Lecidea dispansa | Nyl. (1866) | No | Leimonis erratica | 719 | LC | ||||
| 3999 | Lecidea doliiformis | Coppins & P. James | No | Micarea doliiformis | 1698 | LC NS | ||||
| 4000 | Lecidea dolosa | auct. brit. | No | Lecidella elaeochroma f. elaeochroma | 797 | LC | ||||
| 4001 | Lecidea dubia | Turner & Borrer (1833), non Schaer. (1828) | No | Lecidella pulveracea | 801 | Ex | ||||
| 4002 | Lecidea dubiosa | Zahlbr. | No | Lecidella pulveracea | 801 | Ex | ||||
| 4003 | Lecidea dufourii | Ach. ex Nyl. (1873) | No | Gilbertaria contristans | 309 | as "dufourei" | LC NS | |||
| 4004 | Lecidea ecrustacea | (Anzi ex Arnold) Arnold | No | incorrectly reported from the British Isles | ||||||
| 4005 | Lecidea efflorescens | (Hedl.) Erichsen | No | Biatora efflorescens | 718 | NT NR Sc | ||||
| 4006 | Lecidea effusa | auct. brit. p.p. | No | Bacidia sp. | various Bacidia spp. with pale apothecia | |||||
| 4007 | Lecidea effusa | auct. brit. p.p. | No | Lecania cyrtellina | 614 | LC | ||||
| 4008 | Lecidea effusa f. fuscella | (Fr.) ? | No | Bacidia arceutina | 131 | LC | ||||
| 4009 | Lecidea effusa var. caesiopruinosa | (Mudd) Leight. (1871) | No | Bacidia beckhausii | 135 | LC NS | ||||
| 4010 | Lecidea effusa var. delicata | Larbal. ex Leight. (1879) | No | Bacidina delicata | 144 | LC | ||||
| 4011 | Lecidea effusa var. fuscella | (Fr.) Leight. (1871) | No | Bacidia arceutina | 131 | LC | ||||
| 4012 | Lecidea effusa var. inundata | (Fr.) Leight. (1871) | No | Bacidina inundata | 154 | LC | ||||
| 4013 | Lecidea ehrhartiana | (Ach.) Ach. (1803) | No | Cliostomum corrugatum | 428 | VU B NR P Eng | ||||
| 4014 | Lecidea ehrhartiana var. polytropa | (Hoffm.) Ach. (1808) | No | Lecanora polytropa | 667 | LC | ||||
| 4015 | Lecidea ehrhartiana var. polytropa | auct. brit. p.p. | No | Lecanora intricata | 656 | LC | ||||
| 4016 | Lecidea elaeochroma | (Ach.) Ach. | No | Lecidella elaeochroma f. elaeochroma | 797 | LC | ||||
| 4017 | Lecidea elata | Schaer. | No | Lecanora marginata | 1766 | DD NR Sc | ||||
| 4018 | Lecidea emphysa | Stirt. | No | Arthonia sp. | Arthonia ? vinosa | |||||
| 4019 | Lecidea enclitica | auct. brit. | No | Lecidea paraclitica | 758 | DD NR | ||||
| 4020 | Lecidea endocarpicola | Linds. | No | ? Toniniopsis verrucarioides |