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

Yale University Herbarium
Catalog #: YU.095559
Nathaniel Lyon Gardner s.n. 00 April 1917
Staurastrum protractum L.N.Johnson
United States, California, Cultivated in the Botanical Laboratory of the University of California