Seta (2-)4-12 mm. Capsule stegocarpous, exerted, ovate-cylindric, to 1-2 mm, operculum short-rostrate, peristome teeth rudimentary or 16, cleft to near base. Also keying to this species is a distinctive new species described but not formally named by B. M. Murray (1992) for Alaska; a formal description will be provided in another publication. The new species shares with Stegonia the characteristic rudimentary peristome, ovate leaf with a triangle of clear cells apically and abaxial cell walls more thickened than the adaxial, and bulliform cells on the adaxial surface of the costa, but possesses three kinds of adaxial costal lamellae: (1) rounded lamellae typical of Pterygoneurum, (2) additional, serrate, papillose lamellae near the leaf apex just distal to the rounded lamellae, and (3) on small leaves only lamellae consisting entirely of bulliform, nonpapillose cells.
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