Scagelia occidetale is exclusively a marine species known to be present in the Pacific Northwest, (Washington Coast and British Columbia). Specimens in the FHL Herbarium have been found at Friday Harbor's docks, Cattle Point and Peavine Pass (SW point of Obstruction Island) when dredged at a depth of 5-10 fathoms. (Kylin 1925) The plant is generally epiphytic (attached to other plant individuals) or saxicolous (Abbott et al. 1976). This photographed specimen was attached to another alga that was growing on a tire at Friday Harbor Labs Dock.