| Noun | 1. | order Andreaeales - comprises a single genus: Andreaea plant order - the order of plants Bryopsida, class Bryopsida, class Musci, Musci - true mosses: bryophytes having leafy rather than thalloid gametophytes: comprises orders Andreaeales; Bryales; Dicranales; Eubryales; Sphagnales Andreaea, genus Andreaea - brown or blackish Alpine mosses having a dehiscent capsule with 4 longitudinal slits |