Troia, A., Raimondo, F.M. & Campisi, P. (2014)

The Isoetes longissima complex (Isoetaceae) in Italy: observations on the morphology of spores and leaves, and taxonomic implications

. Phytotaxa 174 (3): 149–156. https://doi.org/10.11646/phytotaxa.174.3.3