All Floras      Advanced Search
BFNA Vol. 1 Login | eFloras Home | Help
BFNA | Family List | BFNA Vol. 1 | Sphagnaceae | Sphagnum

Sphagnum sect. Insulosa Isoviita, Ann. Bot. Fenn. 3: 231. 1966.
[new name for S. sect. Truncata Horre]

Authors: Richard E. Andrus

  • Sphagnum truncata Horrell [[unranked]]

    Plants moderate-sized, with distinct capitulum; pale brownish yellow, yellow-green, loosely tufted. Stems green, superficial cortex of 3--4 layers of efibrillose, inflated, thin-walled, non-ornamented cells , with an occasional pore in the distal end of the outer wall of the superficial cell layer; Stem leaves smaller than branch leaves, oblong to lingulate, moderately lacerate across broad rounded apex, border entire and broad at base; hyaline cells rhomboidal, aporose, non-ornamented, usually efibrillose, resorbed on distal portion of leaf with membrane pleats in proximal portion. Branches dimorphic, the spreading branches stronger than the pendent branches. Branch fascicles with 2--3 spreading and 2--3 pendent branches. Branch stems green, surrounded by 1 layer of efibrillose, non-ornamented, inflated, thin-walled cells with inconspicuous necks. Branch leaves broadly ovate, very concave, apex broadly truncate, smooth, and toothed; margin entire; hyaline cells non-ornamented, fibrillose; with elliptic, ringed pores at ends and corners of cells, usually found in 3's at adjoining cell walls, pores more numerous on concave surface (5--8 per cell) than on convex surface (3--5 per cell); chlorophyllous cells in transverse section narrowly truncate-elliptic to lenticular, lacking wall sculptures, with thickened end walls equally exposed on both surfaces. Sexual condition dioicous. Capsules not seen. Spores not seen.

    A monotypic section (P. Isoviita 1966).

    Lower Taxon

    Related Synonym(s):


  •  |  eFlora Home |  People Search  |  Help  |  ActKey  |  Hu Cards  |  Glossary  |