1818 T. Nuttall I. 148 Smooth, leaves reniform-cordate, acute.
1920 N. L. Britton & C. F. Millspaugh 439 The blades reniform-cordate to suborbicular.
1980 83 48 This subspecies is easily distinguished from the other western species of Scapania by..the reniform-cordate dorsal lobe.