Endogone maritima sp. nov. is described and illustrated. This fungus was recovered from around the roots of endomycorrhizal Ammophila arenaria, Corynephorus canescens, Juncus balticus, J. articulatus, and ectomycorrhizal Pinus sylvestris colonizing a deflation hollow of the Słowiński National Park in Poland. Endogone maritima produces sunflower to brownish yellow zygosporangia enveloped by a separable hyphal mantle consisting of interwoven hyphae appearing in section as a dense net. The zygosporangia occur both singly in the soil and in small, non-peridial sporocarps typically containing 2–7 zygosporangia.