Ambuchanania leucobryoides is the only species of genus Ambuchanania. It is a Sphagnum-like moss endemic to Tasmania. Originally described as a species of Sphagnum, it is now a separate genus on the basis of both unusual morphology and genetic differences.
References
Shaw, A. Jonathan, 2000. "Phylogeny of the Sphagnopsida Based on Chloroplast and Nuclear DNA Sequences" [1], The Bryologist103 (2): 277-306.
Shaw, A. Jonathan, Cymon J. Cox & Sandra B. Boles, 2003. "Polarity of peatmoss (Sphagnum) evolution: who says bryophytes have no roots?" [2], American Journal of Botany90: 1777-1787
Yamaguchi, T., Seppelt R.D., Iwatsuki, Z. & Buchanan, A.M., 1990. "Sphagnum (sect. Buchanania) leucobryoides sect. et sp. nov. from Tasmania" [3], Journal of Bryology16: 45-54.