Premise: Cryptomeria (literally "hidden parts") is a monotypic genus of conifer in the cypress family Cupressaceae, formerly belonging to the family Taxodiaceae. It includes only one species, Cryptomeria japonica (syn. "Cupressus japonica" L.f.). It is endemic to Japan, where it is known as sugi (Japanese: 杉 ). The tree is called Japanese sugi pine or Japanese red-cedar in English.
Hypothesis: English people call the Japanese sugi pine a red-cedar.