| Name | Calyptothecium extensum M. Fleischer |
| Authorship | M. Fleischer |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Calyptothecium |
| Citation | 1908 Musc. Buitenzorg 3: 864 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Calyptothecium extensum M. Fleischer |
| Identification made in | [no date] (1) |
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