1. Agerer R, Ammirati J, Blanz P, Courtecuisse R, Desjardin DE, Gams W, Hallenberg N, Halling RE, Hawksworth DL, Horak E, Korf RP, Mueller GM, Oberwinkler F, Rambold G, Summerbell RC, Triebel D, Watling R (2000) Always deposit vouchers. Mycological Research 104, 642–644. Also published in Canadian Journal of Botany 78, 981; Plant Biology 2, 583; Nova Hedwigia 71, 539–543.
2. Allsopp D, Colwell RR, Hawksworth DL (1995) (Eds) ‘Microbial diversity and ecosystem function.’ (CAB International: Wallingford)
3. Arnolds E (1991) Decline of ectomycorrhizal fungi in Europe. Agriculture, Ecosystems and Environment 35, 209–244.
4. Arnolds E (1992) New evidence for changes in the macromycete flora of the Netherlands. Nova Hedwigia 55, 325–351.
5. Batty AL, Dixon KW, Brundrett MC, Sivasithamparam K (2002) Orchid conservation and mycorrhizal associations. In ‘Microorganism in plant conservation and biodiversity.’ (Eds K Sivasithamparam, KW Dixon and RL Barrett) pp. 195–226. (Kluwer Academic Publishers: Dordrecht)