| Name | Mathiassen, Geir |
| Date of birth | 1954 |
| Remarks | [author note: TROM: Pyrenomycetes] [collector note: TROM] |
| ASA Botanist ID | 111460 botanist |
| GUID | http://purl.oclc.org/net/edu.harvard.huh/guid/uuid/18ff4211-5720-45b0-bbdf-a5a5257b0058 |
| Variant name | Geir Mathiassen |
| Author name | Mathiassen |
| B & P Author Abbrev. | Math. |
| Standard/Label Name | G. Mathiassen |
| Full Name | Mathiassen, Geir |
| Geography Author | Norway |
| Geography Collector | Norway |
| Specialty Author | Fungi and Lichens |
| Citation as Author | Authors of Plant Names. Royal Botanic Gardens, Kew |
| Citation as Author | Index Herbariorum. Part 1: The Herbaria of the World. Eighth Edition. Bronx, NY |
| Citation as Collector | Index Herbariorum, ed. 8 |
| Member of teams/groups | |
| Collector Teams: | Mathiassen & Constantineanu |
| Author Teams: | Mathiassen & Constantineanu |
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