併齒苔屬為壺台科一屬,以蒴齒兩兩成對併列得名。其特徵為苔蒴台部膨大(大於壺部);蒴齒於乾燥時向外翻,潮濕時向內曲。壺苔科臺灣原有兩屬五種,併齒苔首次在臺灣發現,位於小雪山莊附近林道旁土生,植物體叢生如墊狀。
The moss genus Tetraplodon B.S.G. is reported for the first time from Taiwan. Tetraplodon is a genus of the family Splachnaceae. Two other genera, Gymnostomiella and Tayloria, were, reported in Taiwan.