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British Pteridological Society (GB)
 
GdS - Fachgruppe Farne (D)
 
Boomvarenvereniging (B)
 
The Amercian Fern Society  (USA)
 
Hardy Fern Foundation (USA)
 
Connecticut Botanical Society (USA)
 
Delaware Valley Fern and Wildflower Society (USA)
 
Texas Gulf Coast Fern Society  (USA)

Los Angeles International Fern Society  (USA)
 
The Tropical Fern & Exotic Plant Society (USA)
 
The Fern Society of Victoria Inc. (AU)
 
Ferns of the Canberra region (AU)
 
The Society for Growing Australian Plants  (AU)
 
New Zealand Fern Society (NZ)
 
The Fern Society of Southern Africa
 
Fern and Nature Society of the Philippines
 
Fern Siam, Thailand
 
Schweizerische Vereinigung der Farnfeunde