Hi Kirsty,
Fact Sheets for all New Zealand Hymenophyllaceae - except the newly recognised (for the Kermadecs) Trichomanes humile and Hymenophyllum polyanthos (I am working on these) have all been completed, and these fact sheets are well illustrated. Why not simply download that data as a PDF book using the new NZPCN tool to do that and then you'll have the most up to date "book" in the country!
Cheerio
Peter J. de Lange