Spinulum canadense

Spinulum canadense (Nessel) A. Haines is a synonym (Kurtto, A. & P. Uotila, 2019) of:

Spinulum annotinum subsp. dubium (Zoëga) J.H. Xue, Chepinoga & K.P. Ma , an accepted subspecies name sensu Hassler, 2014-2024+.