Cymathaere triplicata (Postels & Rupr.) J.Agardh
Annotated by Robert F. Scagel.

Washington: San Juan: Kanaka Bay, on the west side of San Juan Island.
48.483333° N, 123.083333° W,
Coordinate Source: Specimen Label.
Growing on rocks in the lower intertidal and upper subtidal zones.; rock. Thallus blade-like, up to 4 m. long and 20 cm. broad; blade undivided with three longitudinal folds extending the full length; stipe up to 15 cm. long; holdfast discoid with rudimentary fused haptera; colour pale greenish brown to dark olive brown. Https://oregonflora.org/collections/individual/index.php?occid=4681677.

Robert F. Scagel 73, 1956-7-20
OSC, Catalog: OSC-A-010901, Accession Number: Other: 44, Other: 44