| Name | Marr, Joanna C. W. | 
| First date collected | 1948 | 
| Remarks | [collector note: MIN (± complete). FH, COLO; Plants of the Marr, University of Colorado Ungava Bay Expedition, Northern Quebec, 1948 | 
| ASA Botanist ID | 123782 botanist | 
| GUID | http://purl.oclc.org/net/edu.harvard.huh/guid/uuid/dde33a50-21cc-4ea8-acf4-c8886929ebcf | 
| Variant name | Marr, J. C. W. | 
| Variant name | J. Marr | 
| Standard/Label Name | J. C. W. Marr | 
| Full Name | Marr, Joanna C. W. | 
| Geography Collector | Canada | 
| Specialty Collector | Bryophytes | 
| Citation as Collector | Index Herbariorum - Collectors M | 
| Citation as Collector | specimen (FH) Grimmia affinis Hornsch. | 
| Member of teams/groups |  | 
| Holdings | Search for specimens collected by J. C. W. Marr | 
| Collections in | 1929 (1),  1936 (1),  1938 (2),  1939 (12),  1948 (27) | 
| Collector Teams: | E. C. Abbe, L. B. Abbe & J. C. W. Marr  E. C. Abbe & J. C. W. Marr |