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We describe Pycnolejeunea chocoensis M.E.Reiner & Gradst. sp. nov. from wet lowland rainforest along the Pacific coast of Colombia (Chocó). The new species is distinguished by small decurved lobules, absence of ocelli and small, distant underleaves. Pycnolejeunea chocoensis is a further addition to the unusually rich flora of the Chocó region.