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… 
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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)
TLDR
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.
Reproduction of heterosporous arborescent lycopods in the Mississippian—Pennsylvanian of Euramerica
On a Lycopsid Cone with Winged Spores
TLDR
The Paleozoic strata contain a diverse array of lycopsid fructifications, some of which represent sequences in reproductive specialization leading to the seedlike habit of Lepidocarpon, and these cones are represented by a monosporangiate cone that has winged megaspores.
Palaeobotany is blooming: 1970–1979, a review
  • R. Gould
  • Geography, Environmental Science
  • 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…
Systematics, Phylogenetics, and Reproductive Biology of Flemingites arcuatus sp. nov., an Exceptionally Preserved and Partially Reconstructed Carboniferous Arborescent Lycopsid
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.
Ultrastructural studies of in situ devonian spores: Protobarinophyton pennsylvanicum Brauer
PARALYCOPODITES MOREY & MOREY, FROM THE CARBONIFEROUS OF EURAMERICA—A REASSESSMENT OF GENERIC AFFINITIES AND EVOLUTION OF “LEPIDODENDRON” BREVIFOLIUM WILLIAMSON
TLDR
The morphological characteristics of Paralycopodites brevifolius as a taxon distinct from Lepidodendron and Lepidophloios, and not a morphological intermediate between them, lend support to punctuated equilibria hypotheses.
Arborescent lycopod reproduction and paleoecology in a coal-swamp environment of late Middle Pennsylvanian age (herrin coal, Illinois, U.S.A.)
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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