Published Guide
There is a good introductory guide by Allison Knight, published by the Botanical Society of Otago at https://bso.org.nz/f/mxj58y/knight-introductory-lichen-guide.pdf
Also an Illustrated key to NZ Foliose Lichens, by B & N Malcolm and A Knight: http://nzpcn.org.nz/publications/NZ_FOLIOSE_LICHEN_KEY_low_res_April_2011.pdf
Flora of New Zealand, Volume: Lichens - Revised Second Edition Volume One :
https://floraseries.landcareresearch.co.nz/pages/Book.aspx?fileName=Lichen%20Ed2%20A-Pac.xml
https://floraseries.landcareresearch.co.nz/pages/Book.aspx?fileName=Lichen%20Ed2%20Pan-Z.xml
including KEYS TO GENERA: https://floraseries.landcareresearch.co.nz/pages/MainKey.aspx?id=_19692898-ca1f-478d-9921-43c23ca633cc&fileName=Lichen%20Ed2%20A-Pac.xml
