The leaves of Isoetes lacustris are mostly 5 to 10 centimetres long and may reach 20 centimetres, are 0.7 to 2 millimetres wide, erect or often curved, relatively coarse and stiff.
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The leaves of Isoetes lacustris are mostly 5 to 10 centimetres long and may reach 20 centimetres, are 0.7 to 2 millimetres wide, erect or often curved, relatively coarse and stiff.
The leaves of Isoetes lacustris are fleshy, brittle and dark green, and usually lack stomata.
The megaspores of the lake quillwort are mostly 0.5 to 0.8 millimetres wide and bear toothed crests or raised ridges.
Approved version OWNER-REVIEW-20261108T222539284 · last approved 9 November 2026