Orthotrichum pallens var. pallens
Stem leaves oblong-lanceolate to lanceolate, narrowly obtuse to broadly acute, margins entire. Seta 0.5--1.5 mm; urn oblong-cylindric, becoming strangulate when old, 1.3--2.5 mm, endostome segments 16, long; exostome with 8, reflexed, densely papillose. Calyptra naked. Spores 10--17 µm.
Tree trunks and branches and dry, calcareous or granitic rocks along streams; 300--3000 m; Alta., B.C., Man., Nfld., Nun., Ont., Que., Yukon; Ariz., Calif., Colo., Mich., Minn., Mont., Nev., S.Dak., Utah; Mexico (Nuevo León); Europe.
This variety has entire leaves, 16 endostome segments, and naked calyptra.