The Collaborative International Dictionary of English v.0.48:
Musci \Mus"ci\, n. pl. [L. muscus moss.] (Bot.) An order or subclass of cryptogamous plants; the mosses. See Moss, and Cryptogamia. [1913 Webster]WordNet (r) 3.0 (2006):
Musci n 1: true mosses: bryophytes having leafy rather than thalloid gametophytes: comprises orders Andreaeales; Bryales; Dicranales; Eubryales; Sphagnales [syn: Bryopsida, class Bryopsida, Musci, class Musci]