This is part of our Good Practice Guidance for Habitats and Flora, produced by Richard Jefferson, Dominic Price, Iain Diack, Steve Coates and Andy Mclay.
Reference: Ní Dhúill, E., Smyth, N., Waldren, S. & Lynn, D. (2015) Monitoring methods for the Killarney Fern (Trichomanes speciosum Willd.) in Ireland. Irish Wildlife Manuals, No. 82. National Parks and Wildlife Service, Department of Arts, Heritage and the Gaeltacht, Ireland.