This specimen has not been photographed yet.
Callithamnion tetragonum
As recorded: Callithamnion tetragonum (Withering) S.F.Gray
Plantae › Rhodophyta › Florideophyceae › Ceramiales › Callithamniaceae
- Collected by
- Doty, M.S.; et al.
- Collector number
- 7209
- Date
- August 3, 1947
- Locality
- Penikese Island
- Region
- Massachusetts, United States
- Identified by
- Hare, J.C.
- Record type
- Preserved specimen
Collected the same day
On August 3, 1947, Doty, M.S.; et al. also collected 8 other specimens.
Callithamnion tetragonum observed alive
This specimen was collected in 1947. Since 2000, iNaturalist observers have recorded 2 research-grade sightings in the wild, most recently on 2024-05-09.

2024-05-09
Parque Natural do Sudoeste Alentejano e Costa Vicentina, Bordeira, Algarve, PT
(c) coralga, some rights reserved (CC BY-NC)

2022-08-15
Little Moose Island, Acadia National Park, Hancock County, US-ME, US
(c) hmw, some rights reserved (CC BY-NC)
Observations and photos from iNaturalist, shown only when openly licensed.
Cite this specimen
Callithamnion tetragonum. BISH 527433. Bernice Pauahi Bishop Museum, Honolulu. GBIF occurrence 5956309215. Accessed via explore.bishopmuseum.org/specimens/bish/527433.
Record sources
- GBIF occurrence 5956309215 ↗
- Data license: CC_BY_NC_4_0
- Last harvested October 26, 2026
