| Name | Hammar, Olof Niklas |
| Date of birth | 1821 |
| Date of death | 1875 |
| Remarks | [author note: Herbarium and types unknown, S? (TL2)] |
| ASA Botanist ID | 101688 botanist |
| GUID | http://purl.oclc.org/net/edu.harvard.huh/guid/uuid/58f67f43-a4e2-4911-b19c-0b5cb0148c05 |
| Variant name | Olof Niklas Hammar |
| Author name | Hammar |
| B & P Author Abbrev. | Hammar |
| Standard/Label Name | O. N. Hammar |
| Full Name | Hammar, Olof Niklas |
| Geography Author | Sweden |
| Specialty Author | Bryophytes |
| Specialty Author | Spermatophytes |
| Citation as Author | Taxonomic Literature. Second Edition. Utrecht |
| Citation as Author | Authors of Plant Names. Royal Botanic Gardens, Kew |
| Author in | Monogr. Orthotrich. Ulot. Suec. |
| Author in | Monogr. Slagt Fumaria |
| Author in | Monogr. Gen. Fumar. |
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