Rhizomes: internodes 0.5----4 cm; scales 4----10 mm. Leaves dark red-brown; sheath 1.5--6 cm ´ 1--2 mm; blade 5--20 cm ´ 0.3--1.5 mm, apex notched or with very prominent, acute median tooth; veins ending in teeth or not. Inflorescences solitary. Staminate flowers: peduncles 10--25 mm; distal anthers ca. 0.5 mm higher than the proximal. Pistillate flowers: styles lateral to terminal. Fruits ovoid to globose, 1.5--2 ´ 1.2--1.8 mm.