1. Agrawal DC, Pawar SS, Mascarenhas AF (1993) Cryopreservation of spores of Cyathea spinulosa wall. Ex. Hook. F., an endangered tree fern. J Plant Physiol 142:124–126
2. Aguraiuja R (2010a) Reinforcement of the populations of the critically endangered endemic fern, Diellia pallid, Kaua’I, Hawwaiian Islands, U.S.A. In: Soorae PS (ed) Global re-introduction perspectives: additional case-studies from around the globe. IUCN/SSC Re-introduction Specialist Group. Abu Dhabi, UAE, pp 319–323
3. Aguraiuja R (2010b) Conservation introduction of a locally extinct fern species in Estonia during 1998–2008. In: Soorae PS (ed) Global re-introduction perspectives: additional case-studies from around the globe. IUCN/SSC Re-introduction Specialist Group. Abu Dhabi, UAE, pp 345–348
4. Alexander A, Dudas G, Herren G, Kolben G, Kuhara Y, Murdoch L, Slaven J, Paultre D, Rae N, Rayner J, Vileitaite J, Chamberlain M (2008) Testing the viability of spores held in the fern spore bank at the Royal Botanic Garden, Edinburgh. Newsletter of the Botanical Society of Scotland 91:29–31
5. Aragón CF, Pangua E (2004) Spore viability under different storage conditions in four rupicolous Asplenium L. taxa. Am Fern J 941:28–38