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POWO follows these authorities in synonymising this name:
Fraser-Jenkins, C.R. & Parris, B.S. (2020). Pteridophytes of Turkey - A revised check-list and their relationship to Europe and the West Himalaya. Indian Journal of Forestry 43: 263-284. [Cited as Cystopteris fragilis subsp. diaphana.]
Fraser-Jenkins, C.R. & al. (2018). An Annotated Checklist of Indian Pteridophytes 2: 1-573. Dehra Dun : BSMPS. [Cited as Cystopteris fragilis subsp. diaphana.]
This name was accepted following an alternative taxonomy by these authorities:
Roskov Y. & al. (eds.) (2018). World Ferns: Checklist of Ferns and Lycophytes of the World. Species 2000 & ITIS Catalogue of Life Naturalis, Leiden, the Netherlands. [Cited as Cystopteris viridula.]
Other Kew resources that provide information on this taxon: