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

Washington: San Juan County: Kanaka Bay, on the west side of San Juan Island
48° 29' N, 123° 5' W
Coordinate Source: Specimen Label.
Growing on rocks in the lower intertidal and upper subtidal zones. 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. Substrate: rock.

Robert F. Scagel 73, Jul 20, 1956
OSC, Barcode: OSC-A-010901, 44