| Pottiaceae | * |
Acaulon muticum var. cuspidatum
| (Schimp.) J.J. Amann | Fl. Mouss. Suisse 2: 23 | 1918 |
| Pottiaceae | |
Acaulon muticum subsp. mediterraneum
| (Limpr.) Dixon | Stud. Handb. Brit. Mosses 164 | 1896 |
| Pottiaceae | |
Acaulon muticum var. mediterraneum
| (Limpr.) Sérgio | Bol. Soc. Brot., sér. 2 46: 460 | 1972 |
| Pottiaceae | |
Acaulon muticum var. minus
| (Hook. & Taylor) Bruch & Schimp. | Bryol. Eur. 1: 17, 4B (fasc. 42. Mon. 3. 1B) | 1849 |
| Pottiaceae | |
Acaulon muticum subsp. muticum
| | | |
| Pottiaceae | |
Acaulon muticum var. muticum
| | | |
| Pottiaceae | |
Acaulon muticum var. piligerum
| (De Not.) A. Jaeger | Ber. Thätigk. St. Gallischen Naturwiss. Ges. 1868–69: 78 | 1869 |
| Pottiaceae | |
Acaulon muticum var. rufescens
| (A. Jaeger) H.A. Crum | Bryologist 72: 240 | 1969 |
| Pottiaceae | ** |
Acaulon muticum fo. subintegrifolium
| C.E.O. Jensen | Skand. Bladmossfl. 216 | 1939 |