Ceramium tenuissimum ?
Annotated by N. L. Gardner.

Washington: San Juan County: Olga.
48.619548° N, 122.835459° W,
Datum: WGS 84. Uncertainty: 1104 meters. Coordinate Source: Digital map.
Floating.

G. B. Rigg 75, Jul 1910
FHL, Accession: 1014, Barcode: FHL-A-01453