Plocamium cartilagineum (L.) P.S. Dix.
Annotated by P. W. Gabrielson, 30 Mar 1988. Remarks: University of British Columbia Phycological Herbarium.

Washington: Island County: West Beach, near Partridge Point, on the west side of Whidbey Island.
48° 14' N, 122° 46' W
Datum: WGS 84. Uncertainty: 3446 meters. Coordinate Source: Digital Map.
Growing on rocks in the subtidal zone to a depth of 8 fathoms. Thallus up to 25 cm. high, deep red in colour, cartilaginous, slightly flattened with all branches lying in one plane; pectinately subdivided into several orders or branching. Substrate: saxicolous.

Robert F. Scagel 56, Aug 13, 1955
WTU, Accession: 247776, Barcode: WTU-A-010734