Calliergon cordifolium (Hedw.) Kindb.

Plants medium-sized to large, green, pale green, or sometimes brownish. Stems irregularly radially branched; axillary hair apical cell elongate-rectangular to short-linear. Stem leaves ovate-cordate, triangular-ovate, or narrowly elongate-cordate; costa single, 54-117 (-133) µm wide near base, ending shortly before apex; alar regions indistinctly delimited, triangular, from margins to costa or nearly so; ; medial cells 34-139 7-13(-14) µm. Sexual condition autoicous. Spores 13-20 µm.