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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 8911 | Xanthoria ectaneoides | (Nyl.) Zahlbr. | No | Xanthoria aureola | 1538 | LC | ||||
| 8912 | Xanthoria elegans | (Link) Th. Fr. (1861) | Yes | Xanthoria elegans | Caloplaca elegans; Rusavskia elegans | 1528 | LC | Xanthoria elegans | ||
| 8913 | Xanthoria fallax | auct. brit. | No | Xanthoria ulophyllodes | 1909 | LC NS | ||||
| 8914 | Xanthoria fallax | No | 1529 | BLS number no longer used | ||||||
| 8915 | Xanthoria fulva | (Hoffm.) Poelt & Petut. (1992) | Yes | Xanthoria fulva | Gallowayella fulva; Xanthomendoza fulva; Xanthoria candelaria auct. p.p. | 1918 | doubtfully British | DD NR | Xanthoria fulva | |
| 8916 | Xanthoria lychnea | (Ach.) Th. Fr. | No | Xanthoria candelaria s. lat. | 1527 | LC | ||||
| 8917 | Xanthoria lychnea | auct. p.p. | No | Xanthoria fulva | 1918 | DD NR | ||||
| 8918 | Xanthoria lychnea var. perfusa | (Nyl. ex Lamy) H. Olivier (1894) | Xanthoria candelaria s. lat. | 1527 | LC | |||||
| 8919 | Xanthoria parietina | (L.) Th. Fr. (1860) | Yes | Xanthoria parietina | 1530 | LC | Xanthoria parietina | |||
| 8920 | Xanthoria parietina var. aureola | auct. | No | Xanthoria calcicola | 1526 | LC | ||||
| 8921 | Xanthoria parietina var. ectanea | auct. | No | Xanthoria aureola | 1538 | LC | ||||
| 8922 | Xanthoria polycarpa | (Hoffm.) Th. Fr. ex Rieber (1891) | Yes | Xanthoria polycarpa | Massjukiella polycarpa; Polycauliona polycarpa | 1531 | LC | Xanthoria polycarpa | ||
| 8923 | Xanthoria polycarpa f. lobulata | auct. brit. | No | Xanthoria polycarpa | 1531 | LC | ||||
| 8924 | Xanthoria ucrainica | S.Y. Kondr. (1997) | Yes | Xanthoria ucrainica | Massjukiella ucrainica; Polycauliona ucrainica; Xanthoria candelaria auct. p.p. | 950 | considered by some to be broad-lobed morph of X. candelaria | LC NS | Xanthoria ucrainica | |
| 8925 | Xanthoria ulophyllodes | Räsänen (1931) | Yes | Xanthoria ulophyllodes | Xanthoria candelaria auct. p.p. Xanthoria fallax auct. brit. Xanthomendoza ulophyllodes |
1909 | LC NS | Xanthoria ulophyllodes | ||
| 8926 | Xanthoriicola physciae | (Kalchbr.) D. Hawksw. (1973) | Yes | Xanthoriicola physciae | 2272 | LC | LF | Xanthoriicola physciae | ||
| 8927 | Xenonectriella calabrica | Brackel & Puntillo (2016) | Yes | Xenonectriella calabrica | 2807 | on Pertusaria pertusa | NE NR | LF | ||
| 8928 | Xenonectriella fissuriprodiens | (Etayo) Etayo (2017) | Yes | Xenonectriella fissuriprodiens | Pronectria fissuriprodiens | 2172 | on Lobaria pulmonaria | LC NS | LF | Xenonectriella fissuriprodiens |
| 8929 | Xenonectriella leptaleae | (J. Steiner) Rossman & Lowen (1999) | No | Pronectria leptaleae | 2409 | NE NR | LF | |||
| 8930 | Xenonectriella leptaleoides | (Etayo) Etayo (2008) | Yes | Xenonectriella leptaleoides | Pronectria leptaleoides | 2773 | on Leptogium cyanescens | NE NR | LF | Xenonectriella leptaleoides |
| 8931 | Xenonectriella lutescens | (Arnold) Weese (1919) | Yes | Xenonectriella lutescens | 2548 | NE NR | LF | Xenonectriella lutescens | ||
| 8932 | Xenonectriella physciacearum | F. Berger, E. Zimm. & Brackel (2020) | Yes | Xenonectriella physciacearum | 2796 | lichenicolous on Physcia | NE NR | LF | ||
| 8933 | Xenonectriella septemseptata | (Etayo) Etayo & van den Boom (2014) | Yes | Xenonectriella septemseptata | Pronectria septemseptata | 2765 | on Melanelixia subaurifera | NE NR | LF | |
| 8934 | Xenonectriella streimannii | (S.Y. Kondr., Coppins & D.J. Galloway) Rossman (1999) | Yes | Xenonectriella streimannii | Pronectria streimannii | 2367 | NE NR | LF | Xenonectriella streimannii | |
| 8935 | Xenonectriella subimperspicua | (Speg.) Etayo (2017) | Yes | Xenonectriella subimperspicua | Pronectria subimperspicua | 2753 | on Parmelia & Punctelia spp. | NE NR | LF | |
| 8936 | Xerotrema megalospora | Sherwood & Coppins (1980) | Yes | Xerotrema megalospora | 1960 | NT NR Sc IR | F | Xerotrema megalospora | ||
| 8937 | Xerotrema quercicola | Coppins & Aptroot (2008) | Yes | Xerotrema quercicola | 2518 | NT NR E IR | F | Xerotrema quercicola | ||
| 8938 | Xylographa abietina | (Pers.) Zahlbr. | No | Xylographa parallela | 1532 | LC | ||||
| 8939 | Xylographa andrewii | (Stirt.) Reding. (1938) | No | Geltingia associata | 1943 | LC NS | LF | |||
| 8940 | Xylographa corrugans | Norman | No | Xylographa vitiligo | 1534 | LC |