Pityrogramma trifoliata (L.) R.M.Tryon Pityrogramma trifoliata (L.) R.M.Tryon, Contr. Gray Herb. 189: 68. 1962 sec. Mickel & Smith 2004≡Acrostichum trifoliatum L., Sp. Pl. 2: 1070. 1753 syn. sec. Mickel & Smith 2004