Morphologic interpretation of fertile structures in glossopterid gymnosperms

Schopf, James M.

doi:10.1016/0034-6667(76)90021-x

Cited by 80 publications

(70 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Therefore, the ancestors of these plants which attained sudden ascendancy after the glaciation may be regarded as altogether unknown. Ali the same Schopf (1976) helieves that they may be related to the Cordaitales and Rigby (1978) finds their reproductive parts comparable with the seed-scale complexes of Lebachin and Ernestiodendron. The bases for these views were not elaborated on by either of the above au thors and bence it is not possible to discuss their ideas ftuther.…”

Section: Affinitiesmentioning

confidence: 82%

“…it is adaxial). Roimes (1974) and Schopf (1976) thought that their fertile side faces the leaf but the pedicel in the specimen of Austroglossa is twisted and axillary fructifications described by Pant and Singh (1974) also had their fertile faces tumed towards the axis and their sterile faces towards the subtending leaf. Oearly this must be the normal orientation of the fructifications of the glossopterids as suggested by Pant and Nautiyal (1984).…”

Section: Morphology and Structure Of The Fructificationsmentioning

confidence: 99%

“…Plumstead's account of the fructifications of Glossopteris also deserves the credit of having stimulated the se arch for similar fructifications in other parts of Gondwanaland since it was followed, in quick and continuing succession, by reports of glossopterid fructifications like those made by Plumstead herself (1956aPlumstead herself ( , 1956bPlumstead herself ( , 1958Plumstead herself ( , 1963a, Sen (1955aSen ( , 1955b, Pant (1958b), Nautiyal (1965, 1984), Thomas (1958), Lacey ( 1959), White (1962White ( , 1964White ( , 1978, Rigby (1962, 1968, 1971, 1972), Millau (1967, Schopf (1967Schopf ( , 1976, Banerjee (1969) ; Surange and Maheshwari (1970), Surange and Chandra (1973a, 1973b, 1973c, Holmes (1974), KovacsEnrody (1974), Kyle (1974), Lacey, van Dijk and Gordon-Gray (1975), Benecke (1976, Gould and Delevoryas ( 1977) and others. Besicles fructifications which are found attached to unmodified leaves of Glossopteris and its allies, there are many others which are borne on more or less modified leaves or bracts attributed to the glossopterids on account of their association, and also because they frequently show anastomosing veins.…”

Section: Introductionmentioning

confidence: 96%

“…ln describing the leaf -or bract -attached fructifications of Glossopteris and allied fossils, 1 find that the term «fertiliger» used by Schopf (1976) is quite useful although 1 have used it in a broader sense for microsporangiate (male) as wall as megasporangiate (female) fructifications (Schopf used the term for ovulate organs only). In my usage the term fertiliger includes the bract as weil as its attached fructification.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Reproductive Biology of the Glossopterids and their affinities

Pant

1987

Bulletin de la Société Botanique de France. Actualités Botaniqu

View full text Add to dashboard Cite

Summary.-The author attempts to classify glossopterid fructifications into a number of ca· tegories. He diBt:inguishes three main kinds of reproductive organs, viz., (i) fertiligers where the subtending organ of the fructification iB apparently an unrnodüied glossopterid leaf, (ü) fertiligers whe· re the subtending organ Ï8 a more or less modified leaf or bract and (ili) detached fructifications which are attributed to glossopterids on account of their association in the field. Detached fructifi· cations are briefly discussed and the evidence for their attribution to glossopterids is assessed.The author points out that the glossopterids can either be included in a broadly defined group Pteridospermopsida or kept altogether isolated under Glossopteridales since neither their ancestors nor descendants are presently known.Résumé.-L'auteur propose une classification des fructificatiolll!l glossoptéridiennes. ll distingue troiB types principaux : 1) des structures fertiles où l'organe support de la fructification est une feuille glossoptéri-dienne non modifiée ;2) des structures fertiles dont l'organe support est une feuille ou une bractée plus ou moins modifiée;3) des fructifications iBolées qui sont attribuées aux Glossoperidaceae sur la base de leur association. Des fructificatiolll!l iBolées sont étudiées et leur appartenance aux Glossopteridaceae est diBcutée.L'auteur fait observer que les Glossopteridaceae peuvent soit être incluses dans un groupe très large de Pteridospermopsida soit être classées à part comme Glossopteridales étant donné que nous ne connaÏ88ons actuellement ni leurs ancêtres ni leurs descendants.

show abstract

Section: Affinitiesmentioning

confidence: 82%

Section: Morphology and Structure Of The Fructificationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reproductive Biology of the Glossopterids and their affinities

Pant

1987

Bulletin de la Société Botanique de France. Actualités Botaniqu

View full text Add to dashboard Cite

show abstract

“…Branchlets are also striated, and end in a simple scale-like expansion, as is the case in Golondrinia specimens. Ovule scars, and even a closely associated (if not in direct organic connection with) platyspermic seed, are observed at the base of some of the branchlets, adding stronger support for an affi nity of LIL Pb 1381 with Arberiaceae (although platyspermic seeds are also associated with Rigbyaceae, see Schopf, 1976).…”

Section: Arberia White 1908mentioning

confidence: 99%

New glossopterid polysperms from the Permian La Golondrina Formation (Santa Cruz Province, Argentina): potential affinities and biostratigraphic implications

Cariglino¹

2015

Rev. bras. paleontol.

View full text Add to dashboard Cite

-Impression fossils of ovuliferous fructifi cations from the Permian La Golondrina Formation in Santa Cruz, Argentina, are described, their affi nities compared, and fi nally, assigned to the Arberiaceae (Glossopteridales). Based on morphological differences from the genera in Arberiaceae, a new taxon is established for some specimens, whereas others are allocated to Arberia madagascariensis (Appert) Anderson & Anderson. This is the fi rst record of Arberiaceae from the La Golondrina Basin. The biostratigraphic implications of the occurrence of this family in this unit are discussed, and suggest that more evidence other than that provided by the megafl oral elements is needed to resolve the age of the constituent members of the La Golondrina Formation.

show abstract

Zirabia cylindrica comb. nov. provides evidence of Doyleales in the Jurassic

Elgorriaga

Atkinson

2023

American J of Botany

View full text Add to dashboard Cite

In recent years, Doyleales have played an important role in the discussion and exploration of seed plant relationships and the origin of angiosperms. This order comprises a diversity of recently described genera with cupule-bearing compound ovulate cones recovered from Early Cretaceous deposits in North America and Asia. Their relatively late appearance in the fossil record, stratigraphically near the appearance of angiosperms in the Early Cretaceous, has been noteworthy. Here, we report a new genus of Doyleales, Zirabia gen. nov. from the Early Jurassic of Iran, that was originally described as the ginkgophyte Karkenia. Methods: We reinvestigated material previously assigned to Karkenia cylindrica from the Lower Jurassic of the Zirab locality, Alborz Mountains, northern Iran. Results: The studied specimen features a main axis bearing helically to irregularly arranged bract-cupule complexes, each composed by a long laminar bract subtending and sheathing a cupule stalk that bears a single-seeded cupule with a dorsal protrusion. The morphological features of this taxon do not conform with those of Karkenia, and suggest affinities with Doyleales rather than Ginkgoales. Within Doyleales, this fossil has a unique combination of characters indicating that it is a new genus within the order; thus, a new combination is erected, Zirabia cylindrica. Conclusions: Our results indicate that Doyleales is significantly older than previously thought, with their stratigraphic range now extending from the Lower Jurassic to the Cretaceous. The Early Jurassic occurrence of Doyleales provides important data on the emergence of seed-enclosing structures seen in seed plants throughout the Mesozoic.

show abstract

Morphologic interpretation of fertile structures in glossopterid gymnosperms

Cited by 80 publications

References 9 publications

Reproductive Biology of the Glossopterids and their affinities

Reproductive Biology of the Glossopterids and their affinities

New glossopterid polysperms from the Permian La Golondrina Formation (Santa Cruz Province, Argentina): potential affinities and biostratigraphic implications

Zirabia cylindrica comb. nov. provides evidence of Doyleales in the Jurassic

Contact Info

Product

Resources

About