small, short and weak-stemmed, compact and sprawling in thin mats, green to pale yellow. Stems
green, superficial cortex of thin-walled but not much enlarged or differentiated. Stem leaves
elongate-triangular, 1.3-1.5 mm; often spreading; apex obtuse; hyaline cells mostly efibrillose and 1-septate in proximal half and lateral portions of leaves. Branches
unranked, often blunt and with leaves moderately elongated at distal end. Branch fascicles
with 2-3 spreading and 0-2 pendent branches. Branch stems
green, with cortex enlarged with conspicuous retort cells. Branch leaves
ovate to broadly ovate at branch base and becoming ovate-lanceolate at branch tip; 1.2-1.5 mm; undulate when dry, margins serrulate; hyaline cells of convex surface with 0-5 pores or pseudopores at cell apex, concave surface with faint round wall thinnings in cell angles, but may be absent, chlorophyllous cells trapezoidal in transverse section, exposed more broadly on convex surface. Sexual condition
probably dioicous. Spores
Mats in seasonally wet depressions in coastal plain; low elevations; La., Miss., N.J.
Sporophytes of Sphagnum mississippiense
are unknown. The combination of broad branch leaves and obtuse stem leaves will distinguish it from S. cuspidatum
and S. viride
. The much commoner and more wide-ranging S. trinitense
, although also having serrulate branch leaves, has much narrower branch leaves that are more elongate at the branch tips, becoming quite lanceolate as compared with the ovate-lanceolate branch leaves that S. mississippiense
exhibits at its branch tips.