Ambuchanania leucobryoides is the only species in the monotypic genus Ambuchanania. It is a Sphagnum-like moss endemic to Tasmania. Originally described as a species of Sphagnum, it is now a separate genus named after the original collector Alex M. Buchanan (first collected in 1987). A. leucobryoides differs from the Sphagnaceae family in having elongate antheridia. It is entirely restricted to south-west Tasmania's Wilderness World Heritage Area where it occurs on white Precambrian quartzitic sand deposited by alluvial flows, and on margins of buttongrass (Gymnoschoenus sphaerocephalus) sedge land. Species most commonly found in association with A. leucobryoides include: Leptocarpus tenax, Chordifex hookeri, and Actinotus suffocatus. Currently, A. leucobryoides is listed as rare under the