Difference between revisions of "Sphagnum majus"
in Botaniske Forening København, Festskrift, 106. 1890,.
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Revision as of 16:55, 18 September 2019
Plants moderate-sized to robust, fairly weak-stemmed, lax in submersed forms, ± sprawling in emergent froms; golden brown to dark brown; capitulum weakly 5-radiate, branches straight to strongly laterally curved. Stems green to pale brown, superficial cortex only weakly differentiated. Stem leaves triangular-lingulate, 0.8–1.4 mm, spreading to appressed; apex acute to narrowly obtuse, hyaline cells nonseptate and fibrillose near apex. Branches unranked or weakly 5-ranked, straight to strongly curved, leaves moderately elongated at distal end. Branch fascicles with 2 spreading and 1–2 pendent branches. Branch stems green but sometimes reddish at proximal end, with cortex enlarged with conspicuous retort cells. Branch leaves ovate-lanceolate to narrowly ovate-lanceolate, 1.8–3.4 mm; straight to strongly subsecund; weakly undulate and recurved when dry; margins entire; hyaline cells on convex surface with 1–2 free pores per fibril interval, concave surface aporose or rarely with a few wall thinnings in cell ends and angles; chlorophyllous cells trapezoidal in transverse section and narrowly exposed on concave surface. Sexual condition dioicous. Spores 33–40 µm.
Distribution
North America, Eurasia.
Discussion
Subspecies 2 (2 in the flora).
Selected References
Key
| 1 | Branch leaf hyaline cells on convex leaf surface with 1-2 pores per fibril interval, these usually less than 1/3 the cell diameter. | Sphagnum majus subsp. majus |
| 1 | Branch leaf hyaline cells on convex leaf surface with 1 pore per fibril interval, these more than 1/3 the cell diameter. | Sphagnum majus subsp. norvegicum |