Spongomorpha arcta (Dillwyn) Kützing
Annotated by J. Cruden.

Oregon: Tillamook: Tillamook Bay, North Jetty, opposite entrance to Barview Park, south side of jetty.
45.570553° N, 123.962431° W,
Datum: WGS 84. Coordinate Source: Digital Map.
Attached to rocks, mid-intertidal, full sun and wave action.; rock. The cells were narrow for S. mertensii and equal to or 1.5 times the width; has rhizoidal filaments. Https://oregonflora.org/collections/individual/index.php?occid=4681533.

J. Cruden 47-G, 1978-4-28
OSC, Catalog: OSC-A-010756