1) Class 2) Class bryopsida 3) Class musci 4) Musci 1) Musci 
The Bryopsida constitute the largest class of mosses, containing 95% of all moss species. It consists of approximately 11,500 species, common throughout the whole world. The group is distinguished by having spore capsules with teeth that are arthrodontous; the teeth are separate from each other and jointed at the base where they attach to the open...
[n] - true mosses: bryophytes having leafy rather than thalloid gametophytes: comprises orders Andreaeales
class Bryopsida noun true mosses: bryophytes having leafy rather than thalloid gametophytes: comprises orders Andreaeales; Bryales; Dicranales; Eubryales; Sphagnales