Schistidium antarctici is a species of moss

Moss

Mosses are small, soft plants that are typically 1–10 cm tall, though some species are much larger. They commonly grow close together in clumps or mats in damp or shady locations. They do not have flowers or seeds, and their simple leaves cover the thin wiry stems...

 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

Windmill Islands

The Windmill Islands are an Antarctic group of rocky islands and rocks about wide, paralleling the coast of Wilkes Land for immediately north of Vanderford Glacier along the east side of Vincennes Bay...

 area of Wilkes Land

Wilkes Land

Wilkes Land is a large district of land in eastern Antarctica, formally claimed by Australia as part of the Australian Antarctic Territory, though the validity of this claim has been placed for the period of the operation of the Antarctic Treaty, to which Australia is a signatory...

, Schistidium antarctici is the most common bryophyte

Bryophyte

Bryophyte is a traditional name used to refer to all embryophytes that do not have true vascular tissue and are therefore called 'non-vascular plants'. Some bryophytes do have specialized tissues for the transport of water; however since these do not contain lignin, they are not considered to be...

. 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

Signy Island

Signy Island is a small sub-antarctic island in the South Orkney Islands group locted at . It is about long and wide and rises to above sea level. Much of the island is permanently covered with ice. The average temperature range is to about in winter...

and elsewhere in Northern maritime Antarctica.

Each capsule of the moss produces between 250000 and 520000 spores, each 9.3μm in diameter and with a volume of 143μm³.