1. Physcomitrella patens (Hedw.) Bruch & Schimp. subsp. californica (Crum & Anderson) B. C. Tan 小立碗藓加州亚种 xiao li-wan xian jia-zhou ya-zhong
J. Hattori Bot. Lab. 46: 334. 1979. Physcomitrella californica Crum & Anderson, Bryologist 58: 4. f. 1–5. 1955. Type. U.S.A.: California, L. Koch 1320.
The description of this subspecies is the same as the genus given above.