| 17a Stem cortical cells with greater than 4 pores, hyaline cells on convex (outer) surface with numerous small circular pores along the commissures, often with worm-like ridges on inner walls of branch leaf hyaline cells | Sphagnum henryense | ||
| 17b Stem cortical cells with 2-4 pores, hyaline cells on convex (outer) surface with elliptical pores along the commissures, without worm-like ridges on inner walls of branch leaf hyaline cells | Sphagnum palustre | ||