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Leathesia difformis is a brown algae that is spherical and solid when young, becoming irregularly convoluted, hollow and broadly expanded at maturity, spongy in texture, up to 12 cm. in diameter and yellowish brown in color.
Spotted at Kopachuck State Park. Beach at low tide. Found on rocks and epiphytic on other algae in the intertidal. Pacific Coast Distribution: Bering Sea to Mexico.