Chinnock, R.J. in McCarthy, P.M. (ed.) (1998), Appendix. Isoetaceae. Flora of Australia 48: 705 [tax. nov.]

• Type: "NW side of Comaun Forest Reserve, S.A., 19 Dec. 1973, C.R.Marsden 34 & K.M.Alcock; holo: AD."

• Etymology: "The specific epithet is taken from the Latin attenuatus (gradually diminishing in breadth), in reference to the leaves."

Chinnock, R.J. in McCarthy, P.M. (ed.) (1998), Isoetaceae. Flora of Australia 48: 64, Map 21 APC [secondary reference]

• APC Dist.: SA

Tindale, M.D. & Roy, S.K. (23 December 2002), A cytotaxonomic survey of the Pteridophyta of Australia. Australian Systematic Botany 15(6): 844 [secondary reference]

Field, A.R. (2 January 2020), Classification and typification of Australian lycophytes and ferns based on Pteridophyte Phylogeny Group classification PPG I. Australian Systematic Botany 33(1): 9 [secondary reference]

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