Collins, Holden & Setchell, Phycoth. Bor.-Amer.
Collins, F.S.; Holden, I.; Setchell, W.A. [1-2300]

University Herbarium, University of California, Berkeley
Catalog #: UC1856562
N. L. Gardner #s.n. 26 June 1906
Ulothrix variabilis Kützing
United States, California, Alameda, Campus of University of California, Berkeley.