Sphagnum isoviitae (sect. Cuspidata; the S. recurvum complex) sp. nov. is known by the brown and flat capitulum with a regularly 5-radiate appearance of the outer branches and the inner branches somewhat laterally curved and forming a delimited part, and a visible terminal bud; the acute-apiculate stem leaves longer than broad; the fairly narrow and usually 5-ranked divergent branch leaves which are nonrecurved or indistinctly recurved above when dry; the differentiated stem cortex; and the pale yellow spores. The new species is most closely related to S. fallax (Klinggr.) Klinggr. It grows in transitional poor and intermediate fens, and is reported from north-western Europe and eastern North America.
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Kjell Ivar Flatberg (1992) studied this question.