Isoetes drummondii

Leaves erect or spreading, narrowly cylindric and tapering, 3-20 (rarely to 30) cm long; bases abruptly widened, flattened, overlapping, spoon-shaped, lateral margins pale and papery. Mega-sporangia broadly elliptical (orbicular in outer leaves, more elongate in inner leaves), 6-10 mm long, wall liver-brown and shiny when mature; megaspores 50-200 per sporangium (in outer leaves), white, globular or flattened (and sometimes joined together to be irregular dumb-bell shaped), tuberculate. Microsporangia present or absent.