Hypnum cardotii Thériot, Bot. Gaz. 30: 124, plate 11, fig. 4. 1900 (as cardoti); Campylium cardotii (Thériot) Brotherus; C. stellatum subsp. cardotii (Thériot) Grout

Plants small. Stems irregularly and often sparsely branched. Stem leaves falcate or in some shoots subsquarrose, cordate or broadly ovate, suddenly narrowed to apex, concave, 1-1.4 × 0.7-0.8 mm; base erectopatent to spreading, , insertion slightly curved; margins finely denticulate or sometimes with larger parts entire; apex acuminate, acumen sharply differentiated, furrowed; costa usually 2-fid just beyond base, occasionally with 3 or 4 branches, ending well before mid leaf; alar region transversely triangular, reaching from margin 66-80% distance to costa; ratio of medial laminal cell length (µm) to leaf length (mm) 23.6. Sexual condition unknown.

Habitat unknown; high elevations (2000 m); Mont.

Drepanocladus cardotii is recognized by the small size, Campylium-like appearance, and long-decurrent leaves. This species is only known from the type collection, Avalanche Basin in Glacier Park, and the exact habitat is unknown. The leaf acumina are 0.6-1 times the basal leaf length.