More suggestions and sources
Buchanan, Peter K., and John Barnes. ‘The mushroom industry in New Zealand.’ Mushroom International 87 (2002): 3–5.
Hall, Ian R., and others. Edible and poisonous mushrooms of the world. Christchurch: Crop & Food Research, 2003.
Renowden, Gareth. ‘On the scent of truffles.’ New Zealand Geographic 85 (May–June 2007): 79–88.