“Calothrix parietina” by North American Terrestrial (24 Aug 1949) 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	24 Aug 1949 20th century
Origin	Sturgeon Bay, Emmet County, Michigan, United States, North America Sturgeon Bay
Holding institution	Smithsonian Open Access
Rights	Public domain (CC0)

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Updated 2026-09-05