Rhizome 4-10 mm in diam.; hairs up to 1 cm long. Fronds extremely variable in pro-portions. Sterile fronds 20-60 cm long, lamina up to 21 by 16(-30) cm. Fertile fronds usually longer than sterile ones, up to 52 cm long, lamina (5-)10-12(-25) mm wide. Petioles 20-50 cm long.