Schistidium antarctici is a species of moss found in Antarctica. It lives in compact clumps that are yellowish green at the top and brownish black at the bottom. It grows on both soil and rocks. In the Windmill Islands area of Wilkes Land, Schistidium antarctici is the most common bryophyte. If its habitat supplies ample moisture, it may form a "carpet-like" growth, but if its habitat is dry, it forms a short "cushion-like" growth. It fruits abundantly on Signy Island and elsewhere in Northern maritime Antarctica.