Bartramia halleriana is differentiated from the three other Bartramia species in BC by its only slightly zygomorphic (non-symmetrical) capsules that are hidden among the leaves (immersed). The capsules are on very short setae (stalks) and appear nearly sessile. The common and widespread B. pomiformis closely resembles B. halleriana, grows in similar habitats, and identity of the two species has often been confused. In B. pomiformis, the capsules are distinctly zygomorphic and most are exserted on long setae well above the leaves (Belland 2001).
Source: British Columbia Conservation Data Centre