Plants

Botanical Society of the British Isles (BSBI)

Eden Project

Plantlife

Postcode Plant Database

Woodland Trust

Ferns

Fern World WW (British Pteridological Society)

Lichens

British Lichen Society

Mosses & Liverworts

British Bryological Society 

 Fungi

Association of British Fungus Groups

British Mycological Society

Fungi to be with

Hampshire Fungus Recording Group

Mycology at Kew

Northern Ireland Fungus Group