File:The Quarterly journal of the Geological Society of London (12981468064).jpg

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484
PEOCEEDmGS OF THE GEOLOGICAL SOCIETY. .Jan. 5,
two lines in length and one in breadtli, and placed closely together.
They are elliptical, acuminate, with central leaf-scar, the form and
markings of which could not be perceiyed. The leaves are thick at
the base and short, slightly ascending, and then curving downward.
The branches are slender, straight, and very imiform in thickness in
the portions observed. This plant may be identical with the L. Ghe-
mungense of Hall, from the Devonian rocks of I^ew York ; but I am
not aware that any specimens of that species hitherto observed show
the leaf-scars or leaves ; and, when these are obtained, should the
present species prove distinct, I would name it L. Gaspianum*. Its
characters, as above stated, are represented in figs. 3 a-d.
3. Prototaxites, gen. nov. (Pig. 4.)
Woody trunks with concentric rings of growth and medullary rays.
Cells of pleurenchyma scarcely in regular series, thick-walled, and
cylindrical, with a double series of spiral fibres. Disc-structure in-
distinct in the specimens observed.
I propose the above generic appellation for a tree having the spirally
marked cells characteristic of the genera Taooites and Spiropitys of
Goeppert, but differing from any conifer known to me in the cylin-
drical form and loose aggregation of the wood- cells, as seen in the
Fig. 45.
Sb^crg
Po
Fig. 4. Frototaxites Logani. a, cross-section, magnified 40 diams., showing
growth-line and medullary raj ; b, longitudinal section (300 diams.) ;
e, transverse section (300 diams.).
cross-section, in which particular it more nearly resembles the young
succulent twigs of some modern conifers than their mature wood.-
A fine sihcified trunk of this tree was brought from Gaspe by Sir

  • L. .Sagenaria) Veltheimianum, another ancient and widely distributed species,

resembles the aboTC in the form of the areoles and position of the scars ; but the
leaves and young branches diifer, and my specimens show no median furrow in

the areoles. L. nothum (linger) also seems closely allied.
Date
Source https://www.flickr.com/photos/biodivlibrary/12981468064
Author Geological Society of London
Full title
InfoField
The Quarterly journal of the Geological Society of London.
Page ID
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36162049
Item ID
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111474 (Find related Wikimedia Commons images)
Title ID
InfoField
51125
Page numbers
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Page 484
Names
InfoField
NameFound:L. nothum NameFound:Prototaxites NameConfirmed:Prototaxites Dawson 1859 EOLID:6889433 NameBankID:9712624 NameFound:Sagenaria NameConfirmed:Sagenaria NameBankID:4853108 NameFound:Spiropitys NameConfirmed:Spiropitys NameBankID:4879220 NameFound:Veltheimianum
BHL Page URL
InfoField
https://www.biodiversitylibrary.org/page/36162049
Page type
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Text
Flickr sets
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  • The Quarterly journal of the Geological Society of London. v. 15 (1859).
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Flickr posted date
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7 March 2014
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This file comes from the Biodiversity Heritage Library.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.

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This image was originally posted to Flickr by BioDivLibrary at https://flickr.com/photos/61021753@N02/12981468064. It was reviewed on 26 August 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

26 August 2015

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