“Calothrix parietina” by North American Terrestrial (22 Feb 1946) is a public-domain (CC0) artwork, free to view, download and reuse for any purpose. It is catalogued from the open collection of Smithsonian Open Access.

Calothrix parietina

North American Terrestrial

Title	Calothrix parietina
Artist	North American Terrestrial
Date	22 Feb 1946 20th century
Origin	Rock Creek, Dundy County, Nebraska, United States, North America Rock Creek
Holding institution	Smithsonian Open Access
Rights	Public domain (CC0)

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Updated 2026-09-05