A review of permineralized seed fern stems of the Upper Paleozoic
作者： Michael T. Dunn
DOI: 10.3159/1095-5674(2006)133[20:AROPSF]2.0.CO;2
关键词: Biology 、 Synapomorphy 、 Botany 、 Pennsylvanian 、 Paleontology 、 Paleozoic 、 Fern 、 Lyginopteris 、 Biological sciences
摘要: Abstract Dunn, M. T. (Department of Biological Sciences, Cameron University, Lawton, Oklahoma 73505). A Review Permineralized Seed Fern Stems the Upper Paleozoic. J. Torrey Bot. Soc. 133: 20–32. 2006.—Stem morphotaxa continue to be primary line evidence for pteridosperm phylogenetic analyses, and current state our knowledge Paleozoic permineralized medullosan manoxylic lyginopterid stems is reviewed here. Manoxylic Lyginopteridaceae include Lyginopteris, Heterangium, Rhetinangium, Schopfiastrum, Microspermopteris, Trivena, Tetrastichia, Tristichia, Lyginopitys, Laceya. This group poorly defined, cannot grouped by any as yet known synapomorphy. Four genera are generally included in Medullosaceae; Medullosa, Colpoxylon, Sutcliffia, Quaestora, however Colpoxylon should Medullosa. family characterized rachis bases that vascularized numerous traces produced at more than one node.
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