Lomaridium

Smith, Alan R. & Kessler, Michael, 2018, Prodromus of a fern flora for Bolivia. XXXIII. Blechnaceae, Phytotaxa 334 (2), pp. 99-117 : 108

Key to the Bolivian species of Lomaridium

1 Blades 3–10(–14) cm wide, gradually reduced proximally; pinna pairs 25–80 ............................................................................... 2

– Blades (15–) 18–45 cm wide, abruptly reduced proximally; pinna pairs 6–32 ................................................................................. 3

2 Rhizome scales 8–15 mm long, yellowish to medium brown, apically long-attenuate; blade outline lanceolate; pinna pairs (35–) 40–80; sterile pinnae 2.8–5.0 cm long; fertile pinnae 1.0–2.0 mm wide ........................................................................... L. fragile

– Rhizome scales 5–10 mm long, medium to dark brown, apically acute; blade outline ovate-lanceolate; pinna pairs 25–50; sterile pinnae 4–6.5 cm long; fertile pinnae 1.5–3 mm wide ....................................................................................... L. fuscosquamosum

3 Pinna pairs 6–16; pinnae 1.7–3.2 cm wide, broadest near middle .................................................................................... L. acutum

– Pinna pairs 18–32; pinnae 0.7–1.6 cm wide, generally broadest at base ...................................................................... L. ensiforme