lyginopteridales การใช้

• Nowadays, four orders of Palaeozoic seed plants tend to be referred to as pteridosperms : Lyginopteridales, Medullosales, Callistophytales and Peltaspermales.
• Most evidence of the Lyginopteridales suggests that they grew in tropical latitudes of the time, in North America, Europe and China.
• However, later in Middle Pennsylvanian times the Lyginopteridales went into serious decline, probably being out-competed by the Callistophytales that occupied similar ecological niches but had more sophisticated reproductive strategies.
• The Lyginopteridales became the most abundant group of pteridosperms during Pennsylvanian times the Medullosales took over as the more important of the larger pteridosperms but the Lyginopteridales continued to flourish as climbing ( lianesent ) and scrambling plants.
• The Lyginopteridales became the most abundant group of pteridosperms during Pennsylvanian times the Medullosales took over as the more important of the larger pteridosperms but the Lyginopteridales continued to flourish as climbing ( lianesent ) and scrambling plants.
• In more advanced aneurophytaleans such as " Aneurophyton " these vegetative organs started to look rather more like fronds, and eventually during Late Devonian times the aneurophytaleans are presumed to have given rise to the pteridosperm order, the Lyginopteridales.
• The "'Lyginopteridales "'were the archetypal pteridosperms : They were the first plant fossils to be described as pteridosperms and, thus, the group on which the concept of pteridosperms was first developed; they are the stratigraphically oldest-known pteridosperms, occurring first in late Devonian strata; and they have the most primitive features, most notably in the structure of their ovules.