Hypnum cupressiforme

Cypress-leaved Plait Moss, Hypnum Moss, Sheet Moss, Carpet Moss

Found on every continent except Antarctica, this may be the most widespread moss on Earth. It forms smooth, dense mats of creeping stems covered in overlapping sickle-shaped leaves that look like tiny cypress fronds. It grows on bark, rocks, walls, logs, and soil with equal ease. That adaptability carries over to terrariums, where it does well in both open and closed setups with minimal fuss.