Rhodoptilum plumosum (Harv. & Bailey) Kylin
Annotated by Robert F. Scagel.

Washington: San Juan: At the south end of Shaw Island, near Canoe Island.
48.566667° N, 122.916667° W,
Coordinate Source: Specimen Label.
On rocks and epiphytic on other algae in the upper subtidal zone to a depth of 5 fathoms. HerbariumSpecimenDuplicate: Rhodoptilum plumosum Thallus erect, 15-35cm. high, irregularly branched, with several orders of branches bearing many short lateral branches all approximately the same length and arising distichously. Colour a deep rose red. Substrate: rock, epiphytic. Https://oregonflora.org/collections/individual/index.php?occid=4680528.

Robert F. Scagel 16, 1955-6-27
OSC, Catalog: OSC-A-009715, Accession Number: 9989