Fucus evanescens

Thallus perennial, aggregated, bushy, dichotomously branched in one plane, 5-15 cm high, olive brown to dark brown or almost black. Stipe terete. Branches coriaceous, flat, linear, linear-cuneate (0.4-1.0 cm wide), with prominent percurrent midrib vanishing at apices. Apices bifurcate, emarginated. Pneumatocysts (air bladders) absent. Receptacles oval to linear (0.5-1.3 cm wide, 3-6 cm long), more or less compressed, with blunt or tapering tips, simple or bifurcate, develop at apices, swollen at reproductive maturity. Attachment by diskshaped holdfast. Abundant on intertidal sloping rocks, in sheltered and exposed to moderate wave action.

Arctic to temperate latitudes in Atlantic and Pacific Oceans.