A young Black mangrove takes in oxygen through specialized aerial, or aerating, roots called pneumatophores, which allows the tree to breathe air in habitats that have waterlogged soil. The roots may grow down from the stem, or up from typical roots. While this Florida Keys site may not look like a wetland, the presence of mangroves, pneumatophores and Sea Oxeye Daisy is a clear indicator of a wetland, and a project that would impact this area may require a Department of the Army permit.