Asplenium unisorum, in the fern family Aspleniaceae, grows from a slender, erect rhizome (underground stem), 0.5 to 3 cm (0.2 to 1.2 in) tall and 0.5 to 1 cm (0.2 to 0.4 in) in diameter, which is covered with the bases of the leaf stalks and a few small black scales. Stalks of the fronds are black...