(Steph.) J.J.Engel No year - Engel JJ. Studies on Geocalycaceae (Hepaticae). I. The taxonomic position of Chiloscyphus amplectens (Mitt.) Engel & Schust. together with refinement in Heteroscyphus Schiffn. Journal of the Hattori Botanical Laboratory 68: 303-315. (1990).
There is no corrections for Heteroscyphus varians yet.