Perennial; forming loose mats; main stems aerial, 5-15 cm, spreading, without roots except at the base; rhizomes present; leaves long-decurrent, narrowly elliptic-lanceolate, about 2 mm long, 0.5 mm wide, with marginal cilia and bristle tips; spikes sharply oblong, 5-15 mm long and 0.5 mm wide, sporangia in axils of spike leaves.