Abstract
A new species of Lessonia, L. trabeculata Villouta et Santelices is described from Chile. The two most important characters segregating this new species from all other species of Lessonia are the presence of trabeculae in the cortical lacunae of blades and stipes, and holdfast morphology, which is massive and irregularly shaped. This species extends at least from Antofagasta (c. 23°S) to near Puerto Montt (c. 40°S) along temperate Pacific South America. The plants grow to 2.5 m long often forming extensive kelp beds at depths ranging between 0.5 and 20 m.
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