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plural sphagnums
Any of various widely distributed mosses, of genus Sphagnum, which slowly decompose to form peat. quotations examples
[T]he ground up here is waterlogged and riddled with potholes, holes beneath the spongy coral fern, hidden holes throughout the sphagnum.
1999, Julia Leigh, The Hunter, Faber & Faber 2012, p. 32