Calliergon giganteum (Schimp.) Kindb.

Plants medium-sized to large, brownish, pale pink, or sometimes green or yellowish. Stems regularly radially branched; axillary hair apical cell elongate-rectangular to short-linear. Stem leaves broadly ovate-cordate; costa single, strong, (88-)95-282 µm wide near base, ending shortly before apex; alar regions sharply delimited, triangular, from margins to costa or nearly so; medial laminal cells 40-164 × 7-11(-12) µm. Sexual condition dioicous. Spores 15-21 µm.