"Bryophyta" . . . "Plantae" . . "Pottiaceae" . . . "Pottiales" . . . "Didymodon" . "Didymodon asperifolius (Mitt.) H.A. Crum, Steere and L.E. Anderson" . "Didymodon Moss" . . . . "Bryopsida" . "Didymodon asperifolius" . "(Mitt.) H.A. Crum, Steere and L.E. Anderson" . . . .