Before revision: Description thumb |Moss, clubmoss, ferns and cycads in a greenhouse The Embryophytes emerged a half-billion years ago, at some time in the interval between the mid-Cambrian and early Ordovician, probably from freshwater charophytes, a clade of multicellular green algae similar to extant Klebsormidiophyceae.
After revision: eitheror almost a billion years ago, during the Tonian or Cryogenian,Description thumb |Moss, clubmoss, ferns and cycads in a greenhouse The Embryophytes emerged a half-billion years ago, at some time in the interval between the mid-Cambrian and early Ordovician, probably from freshwater charophytes, a clade of multicellular green algae similar to extant Klebsormidiophyceae.