T. palustris
T. palustris may refer to:
 Tephrocybe palustris, a species of fungus in the family Lyophyllaceae which parasitizes sphagnum moss.
 Terebralia palustris, the mangrove whelk, a species of brackish-water snail in the family Potamididae.
 Thelypteris palustris, the marsh fern, native to eastern North America and across Eurasia.
 Triglochin palustris, Marsh Arrowgrass, a variety of arrowgrass found in damp grassland.
 Tetraodon palustris, a species of pufferfish in the family Tetraodontidae only found in Mekong basin.

See also
 Palustris (disambiguation)