. "Acaulon triquetrum" . . . . . . . "Pottiaceae" . . . "Bryopsida" . . "Bryophyta" . . "Acaulon triquetrum (Spruce) M\u00FCll. Hal. 1847" . "Triangular Pygmy-moss" . "(Spruce) M\u00FCll. Hal. 1847" . "Plantae" . "Acaulon" . . "Pottiales" . .