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BFNA | Family List | BFNA Vol. 1 | Sphagnaceae | Sphagnum

Sphagnum sect. Squarrosa (Russow) Schimper, Syn. ed. 2. 835. 1876.

Authors: Richard E. Andrus

  • Sphagnum squarrosa [[unranked]]

    Plants moderate-sized to robust, with distinct capitulum; green,yellowish brown. Stems green to dark reddish brown, superficial cortex of 2--4 layers of efibrillose, non-ornamented, enlarged, thin-walled, aporose, rectangular cells. Stem leaves ovate, ovate-lingulate to lingulate; with broad, fringed apex; little or no border along margins or base; hyaline cells rhomboidal, efibrillose, non-ornamented, aporose, usually nonseptate, with resorption gaps on exterior surface. Branches strongly dimorphic, pendent branches thinner$ but about same length as spreading branches. Branch stems green, with cortex surrounded by 1--2 layers of efibrillose, non-ornamented, enlarged, thin-walled cells, some cells apically porose with inconspicuous necks. Branch leaves strongly squarrose or spreading, ovate, ovate-hastate or ovate-lanceolate, margins entire, apex involute and smooth; hyaline cells fibrillose; with large, round pores at cell ends and along commissures, sometimes with faint papillae on interior walls; chlorophyllous cells ovate-triangular, elliptical to ovate-elliptical in transverse section, more broadly exposed on convex surface, end walls not thickened. Sexual condition monoicous or dioicous. Capsules 2 mm or more, with scattered pseudomata. Spores less than 30 µm, both surfaces smooth to finely papillose; proximal laesura more than 0.5 spore radius.


    1 Branch leaves markedly truncate; chlorophyll cells ovate-triangular in transverse section, with the widest part at or near the convex surface.   Sphagnum tundrae
    + Branch leaves not truncate; chlorophyll cells elliptical to elliptical-ovate with the broadest part typically some distance from the convex surface.   (2)
           
    2 (1) Branch leaves strongly squarrose (terete in tundra forms), large (1.9--3 mm); hyaline cells of branch leaves with ringed elliptic pores on concave surface and unringed pores on convex surface; fascicles of usually 2 spreading and 2 pendent branches; stem leaves 1/2 to 2/3 as long as branch leaves (1.1-1.9 mm), usually concave, ovate to oblong-lingulate.   Sphagnum squarrosum
    + Branch leaves imbricate (squarrose in shade forms), moderate in size (1--1.5 mm); hyaline cells of branch leaves with unringed pores on concave and convex surfaces; fascicles composed commonly of 3 spreading and 2 pendent branches (also 2 spreading and 2 pendent branches); stem leaves as long or longer than branch leaves (1--1.7 mm), flat, lingulate.   Sphagnum teres

    Lower Taxa

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