Type of Moss That Compacts to Form Peat
Puzzle 1 of TV Classics Easy Pack
Question is: Type of Moss That Compacts to Form Peat
and the answer is: SPHAGNUM
Word Meaning:
SPHAGNUM — Any of various widely distributed mosses, of genus Sphagnum, which slowly decompose to form peat.
Definitions from Wiktionary.