| Name | Callen, Eric Ottleben |
| Date of birth | 1912 |
| Date of death | 1970 |
| Remarks | [author note: Herbarium and types: MTMG] [collector note: Herb. Callen., MTMG. Euphrasia] |
| ASA Botanist ID | 131685 botanist |
| GUID | http://purl.oclc.org/net/edu.harvard.huh/guid/uuid/de5bd955-8804-4819-8137-98c2d6c71be7 |
| Variant name | Eric Ottleben Callen |
| Author name | Callen |
| B & P Author Abbrev. | Callen |
| Standard/Label Name | E. O. Callen |
| Full Name | Callen, Eric Ottleben |
| Geography Author | Canada |
| Specialty Author | Fungi and Lichens |
| Specialty Author | Spermatophytes |
| Specialty Collector | Phanerogams |
| Citation as Author | Authors of Plant Names. Royal Botanic Gardens, Kew |
| Citation as Collector | Rhodora; Journal of the New England Botanical Club. Cambridge, MA |
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