| Polytrichaceae | |
Polytrichastrum alpiniforme
| (Cardot) G.L. Sm. | Mem. New York Bot. Gard. 21(3): 37 | 1971 |
| Polytrichaceae | ! |
Polytrichastrum alpinum
| (Hedw.) G.L. Sm. | Mem. New York Bot. Gard. 21(3): 37 | 1971 |
| Polytrichaceae | ! |
Polytrichastrum altaicum
| Ignatov & G.L. Merr. | Arctoa 5: 76. f. 29 | 1996 [1995] |
| Polytrichaceae | ! |
Polytrichastrum appalachianum
| (L.E. Anderson) G.L. Merr. | Bryologist 95: 271 | 1992 |
| Polytrichaceae | ! |
Polytrichastrum emodi
| G.L. Sm. | J. Hattori Bot. Lab. 38: 633. f. 1–11 | 1974 |
| Polytrichaceae | ! |
Polytrichastrum formosum
| (Hedw.) G.L. Sm. | Mem. New York Bot. Gard. 21(3): 37 | 1971 |
| Polytrichaceae | ! |
Polytrichastrum fragile
| (Bryhn) Schljakov | Novosti Sist. Nizsh. Rast. 19: 209 | 1982 |
| Polytrichaceae | ! |
Polytrichastrum incurvum
| Hedenäs, Bomfleur & E.M. Friis | Fossil Imprint 79(2): 105 | 2023 |
| Polytrichaceae | ! |
Polytrichastrum longisetum
| (Sw. ex Brid.) G.L. Sm. | Mem. New York Bot. Gard. 21(3): 35 | 1971 |
| Polytrichaceae | |
Polytrichastrum lyallii
| (Mitt.) G.L. Sm. | Mem. New York Bot. Gard. 21(3): 40 | 1971 |
| Polytrichaceae | |
Polytrichastrum norwegicum
| (Hedw.) Schljakov | Novosti Sist. Nizsh. Rast. 19: 210 | 1982 |
| Polytrichaceae | ! |
Polytrichastrum ohioense
| (Renauld & Cardot) G.L. Sm. | Mem. New York Bot. Gard. 21(3): 35 | 1971 |
| Polytrichaceae | ! |
Polytrichastrum pallidisetum
| (Funck) G.L. Sm. | Mem. New York Bot. Gard. 21(3): 35 | 1971 |
| Polytrichaceae | ! |
Polytrichastrum papillatum
| G.L. Sm. | J. Hattori Bot. Lab. 38: 633. f. 12–24 | 1974 |
| Polytrichaceae | ! |
Polytrichastrum septentrionale
| (Sw. ex Brid.) E.I. Ivanova, N.E. Bell & Ignatov | Arctoa 23: 176 | 2014 |
| Polytrichaceae | ! |
Polytrichastrum sexangulare
| (Flörke ex Brid.) G.L. Sm. | Mem. New York Bot. Gard. 21(3): 37 | 1971 |
| Polytrichaceae | ! |
Polytrichastrum sphaerothecium
| (Besch.) J.-P. Frahm | Kleine Kryptogamenfl. (ed. 6) 4: 142 | 1995 |
| Polytrichaceae | ! |
Polytrichastrum tenellum
| (Müll. Hal.) G.L. Sm. | Bryologist 78: 201 | 1975 |
| Polytrichaceae | ! |
Polytrichastrum torquatum
| Mitt. ex Osada & G.L. Sm. | J. Hattori Bot. Lab. 38: 636. f. 25–36 | 1974 |
| Polytrichaceae | ! |
Polytrichastrum xanthopilum
| (Wilson ex Mitt.) G.L. Sm. | Mem. New York Bot. Gard. 21(3): 35 | 1971 |