The Flora of North America (FNA) is intended to have two volumes (27 and 8) devoted to mosses, and one (29) to liverworts and hornworts. The books essentially replace Moss Flora of North America by A.J. Grout. There is an introductory chapter on phylogenetics and a key to moss genera. A corrections page for volume 27 os included. All the illustrations are new
The currently known moss flora has 1402 species in 333 genera classified in 81 families. For the genera, 17 (5%) are endemic to the Flora area and 273 (19.5%) of the species are endemic with 36 (2.6%) of those considered to be of conservation concern.
FNA is a synoptic account of the plants of North America north of Mexico ansd is intended as both an identification guide and a systematic conspectus of the North American Flora.