Fronds nearly globular, 0.5--1.4 mm (x 0.4--1.2 mm), 1--1.3 times as long as wide, 1--1.3 times as deep as wide, rounded at apex, papilla absent; upper surface transparently green, with 1--10(--30) stomates; pigment cells absent in vegetative tissue. 2n = 30 (H, U), 40 (U), 42 (D), 500 (U), 70 (70), 80 (U).