Tetrodontium repandum, the small four-tooth moss, is a moss in the family Tetraphidaceae.Schwägrichen, Christian Friedrich. Species Muscorum Frondosorum, Supplementum Secundum 2: 102. 1824. It is one of only two recognized species in the genus Tetrodontium, and is native to subalpine regions of the Northern Hemisphere. It has been reported from Alaska, British Columbia, Washington state, Japan, and Europe.Bryophyte Flora of North America, vol 1
See also List of extinct plants of the British Isles
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