Upper Carboniferous seed fern (Pteridospermophyta) pollen organs from Silesia (Poland) and related evolution considerations

Pacyna, Grzegorz; Zdebska, Danuta

doi:10.5586/mb.2010.001

Cited by 9 publications

(5 citation statements)

References 23 publications

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“…The nomenclatural problem that arises, being rooted in differing fossilization processes of compression vs. permineralization already discussed in detail by Arnold (1947, p. 39), is that the nature of compression precludes preserving the anatomy, but that unlike from compressions, lateral sampling of permineralized specimens is restricted by size and sample preparation. This is exemplified by the reported heteromorphic stomata and the en echelon pattern of trichomes alike which have not been reported from permineralized Dolerotheca by Schopf (1948), Ramanujam et al (1974), Stidd (1981Stidd ( , 1990, Millay & Taylor (1979), Drinnan & Crane (1994) or Pacyna & Zdebska (2010).…”

Section: Generic Assignmentmentioning

confidence: 74%

“…72, fig. 7;Schopf 1948;Stidd 1978aStidd , 1990Stidd et al 1977;Rothwell & Eggert 1986;Drinnan & Crane 1994;Pacyna & Zdebska 2010;and others).…”

Section: Current Terminologyunclassified

“…Hence, a reasonable conclusion at this point would be that the five proposed Forms of grain sizes may harbor more than one fossil-genus. Required for taxonomic resolution are larger collections for example from sideritic concretions, Mazon Creek, or Coseley, England, among others (Pacyna & Zdebska 2012).…”

Section: Monolete Prepollen Grainsmentioning

confidence: 99%

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Five dispersed medullosalean male organs, one species? Late Pennsylvanian Sydney Coalfield, Canada

Zodrow¹,

Pšenička²

2021

Bull. Geosci.

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Dispersed medullosalean male organs are found relatively often in the sedimentary record in Pennsylvanian deposits. Specimens are mostly represented by organs which are of the same/very similar shape and size, and preserved are one or more individuals on a single slab, e.g., Laveine (1971) or Schultka (1995). From the Sydney Coalfield, Canada, ten isolated medullosalean male organs of one species are on record all of them collected by first author of this paper from the shale roof of the Lloyd Cove Seam, basal Cantabrian (Fig. 1). Four specimens are described by Zodrow et al. (2017), and one by Zodrow & Mastalerz (2019). Five medullosalean male organs are described in this paper whose exposed compression features differ in size and shape, and who are embedded within a few centimeters of each other. Two interrelated questions arise: (1) What is the reason for the different settling positions in such a limited physical space? As comparison, for example, Barthel & Brauner (2015, fig. 66) and Schultka (1995, pl. 1) confirmed the tendency of the seed-fern organ Whittleseya Newberry to be flatly preserved. (2) More import antly, do these five organs represent one species in five different settling positions, or five different organ species, implying diversity of seed ferns in this Coalfield? Based on their dissimilar appearances, assignment to five different medullosalean male organ species is, perhaps, taxonomically not unreasonable. However, the answer to (2) is revealed by detailed micromorphological study of crucial organ parts. The authors use the generic name Dolerotheca established by Halle (1933). Historically, the specimens of Do le ro theca that consist of four synangial units were se parated and assigned to the new genus Bernaultia by Rothwell & Eggert (1986). However, the complex of inter nal synangial organization of the presented material is unknown in detail; therefore the described material cannot be seriously compared or even placed under the genus Bernaultia sensu Rothwell & Eggert (1986). The authors submit that the present study probably represents one of the more detailed investigation/expe rimentation to date of North American compressions

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Section: Generic Assignmentmentioning

confidence: 74%

“…72, fig. 7;Schopf 1948;Stidd 1978aStidd , 1990Stidd et al 1977;Rothwell & Eggert 1986;Drinnan & Crane 1994;Pacyna & Zdebska 2010;and others).…”

Section: Current Terminologyunclassified

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Five dispersed medullosalean male organs, one species? Late Pennsylvanian Sydney Coalfield, Canada

Zodrow¹,

Pšenička²

2021

Bull. Geosci.

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“…50;Gillespie and Clendening 1967, pls. 1-3;and Pacyna and Zdebska 2010). In terms of permineralization, however, these rows of paired prepollen sacs ("pit strings") are equivalent to structures seen in a transverse section of specimens of Dolerotheca (Halle 1933;Schopf 1948, pl.…”

Section: Ftir Functional-groupsmentioning

confidence: 98%

Novel preservation state of Dolerotheca (medullosalean male organ) from the Late Pennsylvanian of the Sydney Coalfield, Nova Scotia, Canada

Zodrow¹,

Mastalerz²

2019

atgeol

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A new preservation state for the medullosalean male organ Dolerotheca is exemplified by a detached 31-mm sideritic mold with intact coalified compression from shale from the roof of a coal seam in the Sydney Coalfield, Cape Breton Island, Nova Scotia, Canada. Clearly recognizable in the specimen is the quadripartite campanulum. Furthermore, maceration yielded significant internal information on acellular, cuticular, stomatiferous and pubescent surfaces, and prepollen sacs with grains. Stomata are rare and of the cyclocytic type. The rectangular prepollen sacs occur as doubly paired rows of sporangia that are radially arranged, and contain ellipsoidal prepollen grains 400−520 μm long and circular prepollen grains 330−460 μm in diameter. The approximate ratio of circular to ellipsoidal grains is 1:2. Regardless of shape, the prepollen grains are attributable to the genus Monoletes. The circular grains bear vestigial trilete marks. Infrared-based functional-group chemistry distinguishes between the cover-type compression state and prepollen grains on the basis of higher aliphatic and oxygenated group contents in the grains. In summary, the specimen represents a novel state of nodular preservation with intact compression. Although the specimen is attributed to the genus Dolerotheca, specific assignment is not possible because of limited preservation and material.

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“…isolated spores from Langsettian fertile leaves of the fern Pecopteris (Senftenbergia) pennaeformis, described details of the sporangia and spores, and compared spores isolated in situ with dispersed ones. Karczewska (1969) documented microsporangia with saccate pollen of the lyginopteridalean pteridosperm Paracalathiops stachei from the Namurian A of the Chełm I borehole.In a comprehensive monograph,Pacyna and Zdebska (2010) documented seed fern pollen organs from the Upper Carboniferous of the Lower and Upper Silesian coal basins. Before their research, these organs were very poorly known from the Polish Carboniferous and were mentioned in only a few papers, without appropriate documentation.…”

mentioning

confidence: 99%

Polish Palaeobotany: 750 Million Years of Plant History as Revealed in a Century of Studies. Palaeozoic Macrofossils

Pacyna

Barbacka

2022

Acta Soc Bot Pol

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During the Palaeozoic Era, plants conquered the land and covered greater and greater areas from coastal lowlands to highlands. Palaeobotanical data based on macroremains from Polish Palaeozoic strata complete and enrich the picture of these processes. Knowledge about Polish Palaeozoic macrofloras developed significantly in the last hundred years but is very unevenly distributed among successive geological periods. Ordovician and Silurian macrofossils are single finds. Cores from deep boreholes provided significant material for recognition of Early Devonian plants. Carboniferous floras, especially from coal measures, are best known, as they are most numerous in taxa and specimens. Permian floras are very rare. Based on Devonian and Carboniferous fossils, many new, evolutionarily important taxa were proposed and have entered world science.

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Upper Carboniferous seed fern (Pteridospermophyta) pollen organs from Silesia (Poland) and related evolution considerations

Abstract: Grzegorz Pacyna and Danuta Zdebska. Upper Carboniferous seed fern (Pteridospermophyta) pollen organs from Silesia (Poland) and related evolution considerations.

Cited by 9 publications

References 23 publications

Five dispersed medullosalean male organs, one species? Late Pennsylvanian Sydney Coalfield, Canada

Five dispersed medullosalean male organs, one species? Late Pennsylvanian Sydney Coalfield, Canada

Novel preservation state of Dolerotheca (medullosalean male organ) from the Late Pennsylvanian of the Sydney Coalfield, Nova Scotia, Canada

Polish Palaeobotany: 750 Million Years of Plant History as Revealed in a Century of Studies. Palaeozoic Macrofossils

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