Trematodon mackayi

Dioicous. Plants yellow-green. Stems simple, 2–6 mm long. Leaves erect-spreading and ±twisted, sheathing near base, contorted when dry, abruptly tapered from an oblong base to narrow subula, mostly 4–7 (–8.5) mm long towards stem apex, less than 2 mm long toward base, subula 2–3 times base length, concave in base; apex subulate; costa completely filling subula; margin entire, unistratose; laminal cells of leaf base rectangular or irregularly polygonal, 70–105 (–120) μm long, 12–20 μm wide. Seta 8–15 (–25) mm long, yellow. Capsules erect or inclined, cylindric or oblong with a long tapering neck equal to or longer than urn, (1.5–) 2–3.8 (–5) mm long, straight or curved. Peristome reduced to a hyaline membrane. Operculum rostrate from conic base, c. 1/3 capsule length.