| Hypnaceae | |
Hypnum exannulatum fo. acutum
| (Sanio) Wheldon & A. Wilson | Fl. W. Lancashire 410 | 1907 |
| Hypnaceae | ** |
Hypnum exannulatum var. alpicola
| De Not. ex Schimp. | Syn. Musc. Eur. (ed. 2) 734 | 1876 |
| Hypnaceae | |
Hypnum exannulatum var. alpinum
| Grav. | Rev. Bryol. 10: 35 | 1883 |
| Hypnaceae | * |
Hypnum exannulatum var. brachydictyon
| (Renauld) Paris | Index Bryol. 634 | 1896 |
| Hypnaceae | |
Hypnum exannulatum var. brevicuspis
| (Warnst.) Fam. | Denkschr. Bayer. Bot. Ges. Regensburg 12: 93 | 1913 |
| Hypnaceae | |
Hypnum exannulatum var. cochleae
| Austin | Bot. Gaz. 2: 143 | 1877 |
| Hypnaceae | ** |
Hypnum exannulatum var. dichelymoides
| Pfeff. | Jahresber. Naturf. Ges. Graubündens 1867--68: 78 | 1868 |
| Hypnaceae | |
Hypnum exannulatum fo. exannulatum
| | | |
| Hypnaceae | |
Hypnum exannulatum subsp. exannulatum
| | | |
| Hypnaceae | |
Hypnum exannulatum var. exannulatum
| | | |
| Hypnaceae | |
Hypnum exannulatum var. falcifolium
| (Renauld) Paris | Index Bryol. 634 | 1896 |
| Hypnaceae | ** |
Hypnum exannulatum var. frigidum
| Bryhn | Hedwigia 48: 311 | 1909 |
| Hypnaceae | |
Hypnum exannulatum var. glaciale
| (Renauld) Paris | Index Bryol. 634 | 1896 |
| Hypnaceae | |
Hypnum exannulatum [unranked] holleri
| Sanio | Bot. Centralbl. 4(Gratisbeil. 2): 5 | 1880 |
| Hypnaceae | |
Hypnum exannulatum var. immersum
| Austin | Bot. Gaz. 2: 143 | 1877 |
| Hypnaceae | * |
Hypnum exannulatum var. immersum
| (C.E.O. Jensen) Paris | Index Bryol. (ed. 2) 3: 34 | 1904 |
| Hypnaceae | |
Hypnum exannulatum var. irrigatum
| (Renauld) Paris | Index Bryol. 635 | 1896 |
| Hypnaceae | |
Hypnum exannulatum var. longifolium
| (C.E.O. Jensen) Paris | Index Bryol. (ed. 2) 3: 35 | 1904 |
| Hypnaceae | ** |
Hypnum exannulatum subsp. lycopodioides
| Kindb. ex Paris | Index Bryol. (ed. 2) 3: 35 | 1904 |
| Hypnaceae | ** |
Hypnum exannulatum var. molluscum
| Sanio ex Wheldon & A. Wilson | Fl. W. Lancashire 410 | 1907 |
| Hypnaceae | |
Hypnum exannulatum fo. montanum
| (Renauld ex Wheldon) Wheldon & A. Wilson | Fl. W. Lancashire 410 | 1907 |
| Hypnaceae | |
Hypnum exannulatum var. orthophyllum
| Milde | Bryol. Siles. 349 | 1869 |
| Hypnaceae | |
Hypnum exannulatum var. pinnatum
| (Boulay) Paris | Index Bryol. 635 | 1896 |
| Hypnaceae | |
Hypnum exannulatum fo. polycladum
| (Renauld ex Wheldon) Wheldon & A. Wilson | Fl. W. Lancashire 410 | 1907 |
| Hypnaceae | |
Hypnum exannulatum subsp. pseudolycopodioides
| Kindb. | Ottawa Naturalist 14: 82 | 1900 |
| Hypnaceae | |
Hypnum exannulatum subsp. pseudostramineum
| (Müll. Hal.) Kindb. | Canad. Rec. Sci. 6: 74 | 1894 |
| Hypnaceae | |
Hypnum exannulatum subsp. purpurascens
| (Schimp.) Delogne | Ann. Soc. Belge Microscop. 9: 1591 | 1885 |
| Hypnaceae | |
Hypnum exannulatum var. purpurascens
| (Schimp.) Milde | Bryol. Siles. 349 | 1869 |
| Hypnaceae | * |
Hypnum exannulatum var. purpurascens
| Pfeff. | Bryogeogr. Stud. 87 | 1869 |
| Hypnaceae | |
Hypnum exannulatum subsp. rotae
| (De Not.) Bott. | Atti Soc. Tosc. Sci. Nat. Pisa Mem. 29: 165 | 1913 |
| Hypnaceae | |
Hypnum exannulatum var. rotae
| (De Not.) Pfeff. | Jahresber. Naturf. Ges. Graubündens 1867--68: 78 | 1868 |
| Hypnaceae | |
Hypnum exannulatum var. serratum
| Milde | Bryol. Siles. 349 | 1869 |
| Hypnaceae | |
Hypnum exannulatum fo. stenophylloides
| (Renauld ex Wheldon) Wheldon & A. Wilson | Fl. W. Lancashire 410 | 1907 |
| Hypnaceae | |
Hypnum exannulatum var. stenophyllum
| (Schimp.) Hobk. & Bosw. | London Cat. Brit. Moss. 10 | 1877 |
| Hypnaceae | |
Hypnum exannulatum var. swartzii
| (Lindb.) Austin | Bot. Gaz. 2: 143 | 1877 |
| Hypnaceae | |
Hypnum exannulatum var. tenellum
| (C.E.O. Jensen) Paris | Index Bryol. Suppl. 199 | 1900 |
| Hypnaceae | |
Hypnum exannulatum var. tundrae
| (Arnell) Mönk. | Sitzungsber. Naturf. Ges. Leipzig 32: 55 | 1906 |