On the Megagametophytes of Two Lepidodendracean Cones

@article{BrackHanes1978OnTM,
  title={On the Megagametophytes of Two Lepidodendracean Cones},
  author={Sheila D. Brack‐Hanes},
  journal={Botanical Gazette},
  year={1978},
  volume={139},
  pages={140 - 146}
}
Lepidodendracean fructifications with well-preserved megagametophytes are described from Pennsylvanian petrifactions of eastern Kentucky. One cone is megasporangiate with one functional alate spore in each sporangium; the other cone is bisporangiate with spinose megaspores and papillate microspores. Both strobili have megaspores that contain prothallia with rhizoids and well-developed archegonia. Ontogenetic stages of megagametophytic development in these cones are comparable to stages that… 
EMBRYOGENY AND REPRODUCTIVE BIOLOGY OF BOTHRODENDROSTROBUS MUNDUS (LYCOPSIDA)
Permineralized lycopsid megagametophytes and embryos from Upper Carboniferous strata (Westphalian A) at Burnley, England have been found within isolated megaspores assignable to Setosisporites. The
Megagametophyte Development in the Chaloneriaceae Fam. Nov., Permineralized Paleozoic Isoetales (Lycopsida)
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Megaspores and megagametophytes that exhibit a wide range of variability were discovered within sporangia of the Pennsylvanian fossil lycophyte, Chaloneria cormosa, and are grouped into the Chaloneriaceae fam.
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  • R. Gould
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  • 1981
During the ten years covered by this review, the foci of studies in palaeobotany of plant megafossils and certain non-palynological plant microfossils included Precambrian palaeobotany, early
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TLDR
Stratigraphic comparisons of the megafossils and spores restrict the likely age of the cobble from the Early Mississippian to the Middle Pennsylvanian, where the plants were deposited alongside univalve crustaceans in a swamp environment where preservation was probably enhanced by local volcanic activity.
PARALYCOPODITES MOREY & MOREY, FROM THE CARBONIFEROUS OF EURAMERICA—A REASSESSMENT OF GENERIC AFFINITIES AND EVOLUTION OF “LEPIDODENDRON” BREVIFOLIUM WILLIAMSON
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PROTOBARINOPHYTO N PENNSYL VANICUM BRAUER
TLDR
This investigation examines sporoderm ultrastructure in Protobarinophyton pennsylvanicum Brauer (Barinophytaceae), a Devonian vascular plant that produced both large and small spores in the same sporangium, and suggests that the small spores represent microspores and not immature or aborted large spores.
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