| Name | Heterocladium heteropterum subsp. macounii (Best) Dixon |
| Authorship | (Best) Dixon |
| Rank | Subspecies |
| Placed in | Heterocladium heteropterum (Bridel) Schimper |
| Citation | 1924 Stud. Handb. Brit. Mosses, ed. 3 419 |
| Holdings | 22 Specimens held in the Harvard University Herbaria identified as Heterocladium heteropterum subsp. macounii (Best) Dixon |
| Identification made in | [no date] (22) |