Isoëtes afloramientorum D.F.Brunt. & J.B.S.Pereira, Phytotaxa 415: 219. 2020.

Range:— Known only from the type locality, 63 km S of Concepción (SC).

Ecology:— Very rare; in a seasonal pool (or pools) on exposed surface rock of granite bedrock outcropping within a matrix of seasonally dry forest and cerrado habitats; 450 m.

Notes:— 2 n = probably 44 (Brunton & Pereira 2020).