The Gilbert M. Smith Herbarium (GMS) consists of over 8,000 specimens collected mostly around the Monterey Peninsula, California. GMS comprises four herbarium cases of specimens, representing more than 600 species. Most of the specimens were collected at or near their type localities and were the basis for illustrations in Abbott and Hollenberg's Marine Algae of California. The primary collectors for this herbarium are Isabella A. Abbott (2,100+ specimens), Gilbert M. Smith (~1,000), George J. Hollenberg (~700), L. E. Hair (~600), James N. Norris (~400), and Wheeler J. North (~350). The physical collection is housed at Hopkins Marine Station of Stanford University. The entire collection was digitized as part of the NSF-funded Macroalgal Digitization Project.