Leathesia difformis Areschoug
Annotated by Robert F. Scagel.

Washington: San Juan County: Brown Island, near Friday Harbor.
48.538207° N, 123.003735° W,
Datum: WGS 84. Uncertainty: 527 meters. Coordinate Source: Digital Map.
On rocks, and epiphytic on other algae in the upper intertidal zone. Thallus up to 6 (12) cm. in diameter, yellowish brown in colour; mature thallus of irregular outline with a much convoluted surface and hollow in the center. Interior of thallus with colourless dichotomously and radiately branched filaments with progressively smaller cells toward the surface. Outermost portion of thallus with club-shaped or rounded cells in assimilating filaments, and occasional fascicles of colourless multi-cellular hairs. Substrate: saxicolous.

Robert F. Scagel 21, Jul 1, 1955
WTU, Accession: 244818, Barcode: WTU-A-003119, 1