Plants: moderate-sized to robust, strong-stemmed, lax to somewhat compact, capitulum somewhat flattened to more typically compact and rounded; green to golden brown to pale brown with often a pinkish tinge; carpets to more or less compact, low to moderate sized hummocks. Stems: brown, superficial cortical cells with spiral reinforcing fibrils visible, usually 2–4 pores per cell, comb-fibrils lacking on interior wall. Stem: leaves to 1.7 × 1 mm, occasionally longer; rarely hemiisophyllous; hyaline cells non-ornamented, nonseptate. Branches: long and tapering, leaves ± imbricate to spreading in shade forms. Branch: fascicles with 2 spreading and 2 pendent branches. Branch: stems with hyaline cells non-ornamented; no or weak funnel-like projections on the interior end walls, often with 1 large pore per cell on superficial cell walls. Branch: leaves broadly ovate, 2.2 × 1.3 mm, hyaline cells non-ornamented, convex surface with elliptic pores along the commissures, chlorophyllous cells isosceles-triangular to ovate-triangular in transverse section and just enclosed to just exposed on the convex surface; end wall not thickened. Sexual: condition dioicous. Capsule: with numerous pseudostomata. Spores: 24–33 µm, surface finely papillose to smooth, distal surface with distinct bifurcated Y-mark sculpture; proximal laesura more than 0.6 spore radius. Phenology: Capsules mature mid to late summer.
Sphagnum palustre may occur elsewhere than listed above, but the taxonomy is unclear. In some open-grown situations, it may have a reddish tinge and seem similar to S. magellanicum, but this is a pinkish red color rather than the purplish red of the latter. See discussions under 5. S. henryense and 9. S. papillosum for distinction from those species.