1) Genus bryum 2) Moss genus 
Bryum is a genus of mosses in the family Bryaceae. It was considered the largest in the world until it was split into three in a 2005 publication. As of 2013, it and Bryaceae have been in the process of undergoing significant change based on recent DNA studies. New genera and combinations in Bryaceae (Bryales, Musci) for North America, J. R. Spenc...
[n] - type genus of the Bryaceae: mosses distinguished by mostly erect and tufted gametophytes and symmetrical short-necked capsules
genus Bryum noun type genus of the Bryaceae: mosses distinguished by mostly erect and tufted gametophytes and symmetrical short-necked capsules