Menegazzia tenuis is a species of foliose lichen found in southern South America.

It was formally described as a new species in 1942 by Swedish lichenologist Rolf Santesson.

The type specimen was collected from Puerto Angosto (Desolación Island, Chile)[1] The lichen contains atranorin, lichesterinic acid, and protolichesterinic acid as major lichen products.

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