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Monday, May 11, 2020 | History

2 edition of Pteridosperm male fructifications found in the catalog.

Pteridosperm male fructifications

James Morton Schopf

Pteridosperm male fructifications

American species of Dolerotheca, with notes regarding certain allied forms.

by James Morton Schopf

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  • 20 Currently reading

Published in Urbana .
Written in English

    Subjects:
  • Dolerotheca.

  • Edition Notes

    SeriesIllinois. State Geological Survey. Report of investigations,, no. 142
    Classifications
    LC ClassificationsQE973 .S37
    The Physical Object
    Pagination681-724p.
    Number of Pages724
    ID Numbers
    Open LibraryOL195957M
    LC Control Numbera 49010391
    OCLC/WorldCa4209274

      Paleozoic pollen organs exhibit numerous morphological forms that have been arranged in categories based on their probable organization. Progymnosperm ancestors are characterized by three dimensional branching systems bearing pairs of terminal sporangia. Early Mississippian examples of seed fern fertile branches appear little modified from the by: SCHOPF, J.M., Pteridosperm male fructifications: American species of Dolerotheca, with notes regarding certain allied forms. Journal of Paleontol SELLARDS, E.H., a. On the fertile fronds of Crossotheca and Myriotheca, and on the .

    ADVERTISEMENTS: The following points highlight the top nine theories about ancestors of angiosperms. Some of the theories are: 1. The Isoetes – Monocotyledon Theory 2. The Coniferales-Amentiferae Theory 3. The Gnetaies’-Angiosperm Theory 4. The Anthostrobilus (Bennettitalean) Theory 5. The Caytonialean Theory 6. The Stachyospory-Phyllospermae Theory 7. The Pteridosperm Theory and Others. 1. The term Pteridospermatophyta (or "seed ferns" or "Pteridospermatopsida") refers to several distinct polyphyletic groups of extinct seed-bearing plants (spermatophytes).The earliest fossil evidence for plants of this type is the genus Elkinsia of the late Devonian age. They flourished particularly during the Carboniferous and Permian periods. Pteridosperms declined during the Mesozoic Era and Clade: Polysporangiophytes.

    Pteridosperm definition: any extinct seed-producing fernlike plant of the group Pteridospermae | Meaning, pronunciation, translations and examples. Audio Books & Poetry Community Audio Computers, Technology and Science Music, Full text of "Heyday of the Gymnosperms: systematics and biodiversity of the Late Triassic Molteno fructifications" See other formats.


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Pteridosperm male fructifications by James Morton Schopf Download PDF EPUB FB2

Pteridosperm male fructifications; American species of Dolerotheca, with notes regarding certain allied forms by Schopf, James Morton, A New Pteridosperm Male Fructification From The Middle Pennsylvanian Of Illinois Paperback – January 1, by John Leisman, Gilbert And Peters (Author) See all formats and editions Hide other formats and editionsAuthor: John Leisman, Gilbert And Peters.

Get this from a library. Pteridosperm male fructifications: American species of Dolerotheca, with notes regarding certain allied forms.

[James M Schopf]. Pteridosperm Ma Journal Article Pteridosperm Male Fructifications: American Species of Dolerotheca, with Notes regarding Certain Allied Forms James M.

Schopf Journal of Paleontology. Vol. 22, No. 6 (Nov., ), pp. Published by: SEPM Society for. PTERIDOSPERM MALE FRUCTIFICATIONS: AMERICAN SPECIES OF DOLEROTHECA, WITH NOTES REGARDING CERTAIN ALLIED FORMS JAMES M.

SCHOPF U. Geological Survey, Washington, D. ABSTRACT-Dolerotheca includes a group of pteridosperms (Medullosaceae) char- acterized by very large and unusual pollen-bearing organs. Their botanical per. with pteridosperm foliage and stems and similari-ties among the organs themselves, including spore morphology, have been used with a fair degree of assuredness.

M\4ost of the known male pteridosperm fructi-fications have been assigned to the Whittleseyinae. Halle, in his classic study ofcharacterized this subtribe as possessing large (,u). Pteridosperm remains described from the upper Ipswich Basin include the female fructification, Umkomasia geminata, the male fructification, Pteruchus dubius Author: Gary Pattemore.

PALAOBOTANY A deposit of numerous male pteridosperm fructifi- cations occur together with relatively fewer female pteridosperm fructifications, stem fragments, seeds, Neocalamites fragments, some leaf remains re- sembling Taxus and also a number of different fern fronds.

All these leaves and stems are poorly by: 8. graph of the fructifications in his paper reproduced at natural size indicates they are Spores of other pteridosperm fructifications such as Dolerotheca and Codonotheca SCHOPF, J. Pteridosperm male fructifications: American species of Dolerotheca, with notes regarding certain allied forms.

Jour. Paleont. 22, — Pteridosperm remains described from the upper Ipswich Basin include the female fructification, Umkomasia geminata, the male fructification, Pteruchus dubius, and the foliage Dicroidium feistmantelii. Pteridosperm male fructifications; American species of Dolerotheca, with notes regarding certain allied forms Welcome to the IDEALS Repository.

JavaScript is disabled for your browser. Some features of this site may not work without it. Browse. IDEALS. Veldaa. HelenE SCIENTIFICANDTECHNICALSTAFFOFTHE STATEGEOLOGICALSURVEYDIVISION NaturalResourcesBuilding,Urhana ON,Ph.D.,Chief ENIDTOWNLEY,M.S.

The morphology and unstructure of Cycadeoidea dacotensis pollen is descibed. The presence of what appear to be cellular stages in the development of the mature microgametophyte are shown to be the result of external exine by:   Pteridosperm male fructifications: American species of Dolerotheca, with notes regarding certain allied forms.

Paleont. Cited by: Scott, D. On the structure and affinities of fossil plants from the Palaeozoic rocks. III. OnMedullosa anglica, a new representative of the Trans. Royal Soc. London, B, 81– CrossRef Google ScholarCited by: Pteridosperm remains described from the upper Ipswich Basin include the female fructification, Umkomasia geminata, the male fructification, Pteruchus dubius, and the foliage Dicroidium feistmantelii.

It is likely that these remains were from the same plant. While the male reproductive organs of the pteridosperms have been considered the result of aggregation of fertile telomes, Schopf () has presented evidence that in the medullosan Dolerotheca the male fructification is an elaborate campanulate "septangium", composed of radially arranged and paired rows of.

Video shows what pteridosperm means. Any of various extinct gymnosperms, of the division Pteridospermatophyta, resembling ferns, but producing seeds instead of spores. Pteridosperm Meaning.

How to. Pteridosperm male fructifications: American species of Dolerotheca, with notes regarding certain allied forms. Report of Investigations Report of Investigations State Geological Survey of. Pteridosperm male fructifications; American species of Dolerotheca, with notes regarding certain allied forms, Illinois State Geological Survey, ReportUrbana L.

Wilson, Ray Bentallと共著 An Annotated Synopsis of Paleozoic Fossil Spores and the Definition of Generic Groups, Illinois State Geological Survey, Rep Urbana. Pteridosperm remains described from the upper Ipswich Basin include the female fructification, Umkomasia geminata, the male fructification, Pteruchus dubius, and the foliage Dicroidium feistmantelii.

It is likely that these remains were from the same plant. Also described are several conifer, cycadalean, equisetalean, lycopod and pteridophyte.RI Pteridosperm Male Fructifications—American Species of Dolerotheca, with Notes Regarding Certain Allied Forms.

(Reprinted from Journal of Paleontology, v. 22, p.). RI Metamorphism of Coal by Peridotite Dikes in Southern Illinois. 8p. RI Mayostachys - A New Calamite Fructification.

37p., 6pls.Define pteridosperm. pteridosperm synonyms, pteridosperm pronunciation, pteridosperm translation, English dictionary definition of pteridosperm. n 1. any extinct seed-producing fernlike plant of the group Pteridospermae.

Some pteridosperm stems and fructifications with particular reference to the Medullosae. The telome theory. Less.