psilophyton การใช้

• Dawson named another specimen " Psilophyton robustius ".
• Almost all the species of " Psilophyton " have been found in rocks of Emsian age ( around ).
• It shows two of the better-known species of " Psilophyton " as early-diverging members of the euphyllophytes.
• Like some " Psilophyton " species, " Aarabia " had short side branches in which the last sections curved back on themselves.
• The sporangia were from " Psilophyton ", but some aerial stems were from what is now " Sawdonia ", and the rhizomes were from " Taeniocrada ".
• In 1968, Banks proposed splitting it into three groups, one of which was the subdivision Trimerophytina, informally called the trimerophytes . " Psilophyton " was a prominent member of this group.
• Trimerophytes comprised plants with large clusters of downwards curving terminal sporangia that split along their length to release their spores and had centrarch xylem strands ( e . g ., " Psilophyton " ).
• While the pattern of branching and fertile structures such as sporangia are unknown, " Franhueberia " is most similar anatomically to other basal euphyllophytes like " Armoricaphyton chateaupannense " and " Psilophyton dawsonii ".
• As with all species of " Psilophyton ", pairs of sporangia were created by dichotomously branching fertile units, although in " P . primitivum " there were relatively few per unit ( 4 8 ) and they were somewhat loosely clustered.
• Much later, in 1967, it was shown that fossils called " " Psilophyton princeps " " had two very different patterns of xylem development : from the centre outwards ( centrarch ) in " P . princeps " and from the outside inwards ( exarch ) in " P . princeps " var . " ornatum ".
• In 1899 he travelled to Sri Lanka and Malaya to study tropical cryptogams and collect samples, returning to Britain in 1902, when he became a lecturer at the University of Glasgow; while there he worked closely with D . T . Gwynne-Vaughan and Bower, with the three of them being known as the " triumvirate " . he studied preserved plant remnants in Aberdeen, making great insights into the nature of " Psilophyton ", which until then had been neglected.