Cystoseira geminata C.Agardh
Annotated by Robert F. Scagel.

Washington: San Juan County: Goose Island, at the south entrance to San Juan Channel
48° 27' N, 122° 57' W
Coordinate Source: Specimen Label.
On rocks in the lower intertidal and upper subtidal zones. Thallus erect, 1-3 m. high, attached by a conical disc. The basal part comprises a stout stipe from 0.5-1.0 cm. in diameter from which arise numerous branches. At first the branches are filiform, becoming spatulate near the base, later and in the distal portions becoming shorter and terminating in fusiform air vesicles and swollen receptacles. The vesicles are produced singly or in groups of 2 or 3 with the terminal one on the branch apiculate. Colour olive brown to brownish black. Substrate: rock.

Robert F. Scagel 14, Jun 21, 1955
OSC, Barcode: OSC-A-010906, 11