Austroblechnum norfolkianum, Locally common growing along stream beds and stream banks. The most common ground fern encountered. Growing in this location beneath very large leaved Piper excelsum with Diplazium australe and Deparia petersenii subsp. congrua. I have added this as I am trying to sort through the updated names and any distinguishing difference if any between Austroblechnum lanceolatum. See http://naturewatch.org.nz/observations/9560262