SPHAGNUM
sphagnum, sphagnum moss, peat moss, bog moss
(noun) any of various pale or ashy mosses of the genus Sphagnum whose decomposed remains form peat
Source: WordNet® 3.1
Etymology
From the genus name.
Noun
sphagnum (plural sphagnums)
Any of various widely distributed mosses, of genus Sphagnum, which slowly decompose to form peat.
Synonym: peat moss
Source: Wiktionary
Sphag"num, n. Etym: [NL., fr/ Gr. (Bot.)
Definition: A genus of mosses having white leaves slightly tinged with red
or green and found growing in marshy places; bog moss; peat moss.
Source: Webster’s Unabridged Dictionary 1913 Edition