Philosophical Transactions of the Royal Society of London Volume 189, PT. 2; Containing Papers of a Biological Character by Royal Society
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 Excerpt: ...II., pp. 1-6. details above described, and I consider it to be the most important result of this investigation. But it is our duty not only to contemplate possible views, but to decide which is, in our own opinion, the more probable. Having in view, in addition to the facts from palaeontology and from the study of development, the comparison with other Pteridophyta and the facts from septate anthers of Angiosperms, it seems to me probable that a progressive septation has taken place in certain types of Marattiaceae, where the sori are elongated, such as Dancea, and in a less degree Marattia and Kaulfussia. It may be a question how far a similar septation may be accountable for the origin in the first instance of a sorus with a plurality of sporangia united together, as in Asterotheca, though I think this not improbably the mode of their origin. I am disposed to regard such synangial types as being probably the more primitive, and to think that a progressive separation of the individual sporangia has led from these to such a type as Angiopteris or Hawlea. This view is at least consistent with the facts, so far as I understand them, though it is not put forward as in any way demonstrated. A full discussion of this matter will, however, be deferred for the present; it will find its best place when the Leptosporangiate ferns have been examined, and it is to them that the next part of these Studies will be largely devoted, while it will also include a discussion of the morphology of the spore-producing members of Pteridophytes at large. Certain of the facts brought forward in this Memoir have a general bearing. It follows from the occurrence of partial septa, and of gradual steps in septation, that in the cases where this occurs the identity of the individual sp...
Read online Philosophical Transactions of the Royal Society of London Volume 189, PT. 2; Containing Papers of a Biological Character Buy Philosophical Transactions of the Royal Society of London Volume 189, PT. 2; Containing Papers of a Biological Character Download and read Philosophical Transactions of the Royal Society of London Volume 189, PT. 2; Containing Papers of a Biological Character ebook, pdf, djvu, epub, mobi, fb2, zip, rar, torrent Download to iPad/iPhone/iOS, B&N nook Philosophical Transactions of the Royal Society of London Volume 189, PT. 2; Containing Papers of a Biological Character
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Author: Royal Society
Number of Pages: 86 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130289213
File size: 41 Mb
Download Link: Philosophical Transactions of the Royal Society of London Volume 189, PT. 2; Containing Papers of a Biological Character
---------------------------------------------------------------
Author: Royal Society
Number of Pages: 86 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130289213
File size: 41 Mb
Download Link: Philosophical Transactions of the Royal Society of London Volume 189, PT. 2; Containing Papers of a Biological Character
---------------------------------------------------------------
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 Excerpt: ...II., pp. 1-6. details above described, and I consider it to be the most important result of this investigation. But it is our duty not only to contemplate possible views, but to decide which is, in our own opinion, the more probable. Having in view, in addition to the facts from palaeontology and from the study of development, the comparison with other Pteridophyta and the facts from septate anthers of Angiosperms, it seems to me probable that a progressive septation has taken place in certain types of Marattiaceae, where the sori are elongated, such as Dancea, and in a less degree Marattia and Kaulfussia. It may be a question how far a similar septation may be accountable for the origin in the first instance of a sorus with a plurality of sporangia united together, as in Asterotheca, though I think this not improbably the mode of their origin. I am disposed to regard such synangial types as being probably the more primitive, and to think that a progressive separation of the individual sporangia has led from these to such a type as Angiopteris or Hawlea. This view is at least consistent with the facts, so far as I understand them, though it is not put forward as in any way demonstrated. A full discussion of this matter will, however, be deferred for the present; it will find its best place when the Leptosporangiate ferns have been examined, and it is to them that the next part of these Studies will be largely devoted, while it will also include a discussion of the morphology of the spore-producing members of Pteridophytes at large. Certain of the facts brought forward in this Memoir have a general bearing. It follows from the occurrence of partial septa, and of gradual steps in septation, that in the cases where this occurs the identity of the individual sp...
Read online Philosophical Transactions of the Royal Society of London Volume 189, PT. 2; Containing Papers of a Biological Character Buy Philosophical Transactions of the Royal Society of London Volume 189, PT. 2; Containing Papers of a Biological Character Download and read Philosophical Transactions of the Royal Society of London Volume 189, PT. 2; Containing Papers of a Biological Character ebook, pdf, djvu, epub, mobi, fb2, zip, rar, torrent Download to iPad/iPhone/iOS, B&N nook Philosophical Transactions of the Royal Society of London Volume 189, PT. 2; Containing Papers of a Biological Character
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