Isoetes tenuifolia sensu Faden, non Jermy

Annual (fide Faden), almost completely submerged or on mud. Corm 2–3-lobed; leaves densely tufted, 3–16 cm long, 0.7–8 mm wide at middle; ligule narrowly triangular, 2 mm long. Velum complete, shiny black and reticulate, the adjacent leaf margin pale and thin, 1–2 mm wide above, narrower in sporangial area. Megaspores with rather scattered tubercles on large face, 3 smaller faces with small low indistinct tubercles or almost smooth.

Seasonal and long lasting pools and marshes with grasses and sedges, c. 1520 m.

See African distribution.

Kenya.

Terrestrial.