Upper carboniferous and lower permian conifers

Florin, Rudolf

doi:10.1007/bf02873610

Cited by 46 publications

(10 citation statements)

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“…The torus-margo pitting of extant conifers and Ginkgo evolved twice, independently in each of these clades. Such a conclusion is supported by phylogenies (Crane 1985) in which the plesiomorphic character of ginkgophyte reproductive biology places it below a node containing the reproductively similar cordaites and conifers (Florin 1950, 1951, Rothwell 1982, Rothwell et al 1997). …”

Section: Discussionmentioning

confidence: 94%

A physiologically explicit morphospace for tracheid-based water transport in modern and extinct seed plants

Wilson¹,

Knoll²

2010

Paleobiology

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Section: Discussionmentioning

confidence: 94%

A physiologically explicit morphospace for tracheid-based water transport in modern and extinct seed plants

Wilson¹,

Knoll²

2010

Paleobiology

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“…Doyle, 1996). Florin (1931Florin ( , 1933Florin ( , 1950 also employed the now standardized mesogenous-perigenous terminology for stomatal development (summarized by Pant, 1979;Payne, 1979; for updated definitions see Box 1 and Fig. 2).…”

Section: Introductionmentioning

confidence: 99%

Several developmental and morphogenetic factors govern the evolution of stomatal patterning in land plants

2013

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598I.599II.601III.601IV.604V.606VI.607VII.608VIII.610611References611 Summary We evaluate stomatal development in terms of its primary morphogenetic factors and place it in a phylogenetic context, including clarification of the contrasting specialist terms that are used by different sets of researchers. The genetic and structural bases for stomatal development are well conserved and increasingly well understood in extant taxa, but many phylogenetically crucial plant lineages are known only from fossils, in which it is problematic to infer development. For example, specialized lateral subsidiary cells that occur adjacent to the guard cells in some taxa can be derived either from the same cell lineage as the guard cells or from an adjacent cell file. A potentially key factor in land‐plant evolution is the presence (mesogenous type) or absence (perigenous type) of at least one asymmetric division in the cell lineage leading to the guard‐mother cell. However, the question whether perigenous or mesogenous development is ancestral in land plants cannot yet be answered definitively based on existing data. Establishment of ‘fossil fingerprints’ as developmental markers is critical for understanding the evolution of stomatal patterning. Long cell–short cell alternation in the developing leaf epidermis indicates that the stomata are derived from an asymmetric mitosis. Other potential developmental markers include nonrandom stomatal orientation and a range of variation in relative sizes of epidermal cells. Records of occasional giant stomata in fossil bennettites could indicate development of a similar type to early‐divergent angiosperms.

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“…His work culminated in a broadly accepted understanding of the systematic diversity of conifers, including both the homologies and presumed evolutionary origin of modern ovulate conifer cone structure (Florin, 1951). Florin (1927Florin ( , 1938Florin ( -1945Florin ( , 1950Florin ( , 1951 recognized that the form genus Walchia Sternberg represents the vegetative leafy branching systems of at least two genera of plants that he named Lebachia Florin and Ernestiodendron (Florin) Florin, as well as other less completely understood genera.…”

Section: Introductionmentioning

confidence: 99%

Hanskerpiagen. nov. and phylogenetic relationships among the most ancient conifers (Voltziales)

Rothwell

Mapes

Hernandez‐Castillo

2005

TAXON

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A new fossilized walchian (Voltziales) conifer plant from the Late Pennsylvanian Hamilton Quarry of Kansas, U.S.A. combines morphological characters of the morphogenus Walchia and the fossil plant genus Otovicia, with cuticular characters like those of the fossil plant genus Ernestiodendron, and seed cone morphology like that of the fossil plant genus Emporia. Internal anatomical characters are basically similar to the other walchian genera for which such features are known, but some are taxonomically informative. Numerical cladistic analysis reveals that this novel combination of characters defines a new fossil plant genus and species of walchian conifers Hanskerpia hamiltonensis. This analysis provides a test of hypotheses for relationships among walchian and other ancient conifers. Results of this analysis support some previously proposed relationships among the most primitive conifers and other Paleozoic coniferophytes. However, the analysis also calls to question the validity of all previously proposed familial circumscriptions for walchian conifers, and highlights the perplexing systematic challenges posed by the most ancient fossil conifers. The unexpected species richness of voltzialean conifers is interpreted as having resulted from the evolutionary ecology of unstable environments.

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Upper carboniferous and lower permian conifers

Cited by 46 publications

References 0 publications

A physiologically explicit morphospace for tracheid-based water transport in modern and extinct seed plants

A physiologically explicit morphospace for tracheid-based water transport in modern and extinct seed plants

Several developmental and morphogenetic factors govern the evolution of stomatal patterning in land plants

Hanskerpiagen. nov. and phylogenetic relationships among the most ancient conifers (Voltziales)

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