Diselma archeri (syn. Fitzroya archeri (Hook.f.) Benth. & Hook.) is a species of plant of the family Cupressaceae and the sole species in the genus Diselma. It is endemic to the alpine regions of Tasmania’s southwest and Central Highlands, on the western coast ranges and Lake St. Clair, at an altitude ranging from 910-1220 m.
It is a dioecious shrub or, rarely, a small tree, growing to 1-6 m. The leaves are scale-like, 2-3 mm long, arranged in four ranks in opposite decussate pairs. The cones are among the smallest of any conifer, 2-3 mm long, green ripening brown in about 7-8 months from pollination, and have four scales arranged in two opposite pairs, each scale bearing a short bract; the upper pair of scales bearing two small winged seeds.