| Southbyaceae | |
Southbya alicularia
| (De Not.) C. Massal. | Annuario Reale Ist. Bot. Roma 2: 96, 147 | 1886 |
| Southbyaceae | |
Southbya biformis
| (Austin) Austin | Hepat. Bor.-Amer. Exsicc. 9 (no. 26) | 1873 |
| Southbyaceae | |
Southbya crenulata
| (Mitt.) Bernet | Cat. Hép. Suisse 55 | 1888 |
| Southbyaceae | ** |
Southbya erecta
| J.B. Jack ex Váňa | J. Hattori Bot. Lab. 36: 64 | 1972 [1973] |
| Southbyaceae | ** |
Southbya fennica
| (Gottsche) Gottsche | Hepat. Eur. 42–44: no. 418 | 1868 |
| Southbyaceae | |
Southbya fennica
| (Gottsche) C. Hartm. | Handb. Skand. Fl. (ed. 10) 2: 130 | 1871 |
| Southbyaceae | |
Southbya gollanii
| Steph. | Bull. Herb. Boissier, sér. 2, 6: 381 | 1906 |
| Southbyaceae | |
Southbya grollei
| N. Kitag. | Acta Phytotax. Geobot. 25: 127 | 1973 |
| Southbyaceae | |
Southbya hyalina
| (Lyell) Husn. | Hepaticol. Gall. 16 | 1875 |
| Southbyaceae | ! |
Southbya laevifolia
| R.M. Schust. | Nova Hedwigia Beih. 120: 550, f. 572, 573, 573A | 2021 |
| Southbyaceae | ** |
Southbya laevis
| R.M. Schust. | Nova Hedwigia Beih. 120: 542, 548 | 2021 |
| Southbyaceae | ! |
Southbya nigrella
| (De Not.) Henriq. | Bol. Soc. Brot. 4: 244 | 1887 |
| Southbyaceae | |
Southbya obovata
| (Nees) Lindb. | Revis. Crit. Icon. 113, 115 | 1871 |
| Southbyaceae | |
Southbya organensis
| Herzog | Memoranda Soc. Fauna Fl. Fenn. 25: 53 | 1950 |
| Southbyaceae | ** |
Southbya pyrenaica
| Mitt. ex Dumort. | Bull. Soc. Roy. Bot. Belgique 13: 134 | 1874 |
| Southbyaceae | |
Southbya stillicidiorum
| (Raddi) Lindb. | Not. Sällsk. Fauna Fl. Fenn. Förh. 13: 368 | 1874 |
| Southbyaceae | |
Southbya subelliptica
| (Lindb. ex Heeg) Lett | Sp. Hepat. Brit. Isl. 140 | 1902 |
| Southbyaceae | ! |
Southbya tophacea
| (Spruce) Spruce | Ann. Mag. Nat. Hist., ser. 2, 3: 501 | 1849 |