. Further, many moss species have the ability to reproduce asexually using bundles of cells called gemmae. Kop., Pseudopohlia R. S. Williams, Rhizomnium (Broth.) Scientists also list four other kingdoms including bacteria, archaebacteria, fungi, and protozoa. Broth., Brymela Crosby & B. H. Allen, Callicostella (Mll. = Aongstroemia Bruch & Schimp. Type: Echinodium Jur. Aknowledgments:We have made several corrections, based on comments kindly submitted by Drs. W.R. Buck & Vitt Type: Pterobryella (Mll. Early Middle Ordovician evidence for land plants in Argentina (eastern Gondwana). M. Rhizogemma Bonfim Santos, Siebel & Fedosov, Rhizogemmaceae Bonfim Santos, Siebel & Fedosov. Powellia Mitt., Powelliopsis Zanten, Racopilum P. & W.R. Buck. The family Buxbaumiacae (with just the one genus Buxbaumia) would be placed in an order of its own, Buxbaumiales, within the class Bryopsida. Aligrimmia R. S. Williams, Brachydontium Frnr., Campylostelium Bruch & Schimp., Indusiella Broth. Although mosses are rather small organisms, their morphology is relatively complex. Scouleriaceae S. P. Churchill in Funk & D. R. Brooks Type: Scouleria Hook. Bartramiaceae Schwgr. Type: Racopilum P. Beauv. AongstroemiaBruch & Schimp., Calcidicranella Bonfim Santos, Fedosov & Jan Kuera, Dichodontium Schimp., Dicranoweisia Milde, Diobelonella Ochyra, Eucamptodon Mont.,