Philosophical Transactions of the Royal Society of London
Philosophical Transactions of the Royal Society of London
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In our eReader you can find the full English version of the book. Read Philosophical Transactions of the Royal Society of London Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Philosophical Transactions of the Royal Society of London
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As far as I can see, the facts from fossils would be consistent with either view. Nor does the argument from comparison and develop- ment of living forms lead to any definite conclusion, so long as we treat the Marattiaceae on their own merits, and do not proceed on the assumption that they were descended from Leptosporangiate ferns. Comparing them, inter se, it would be possible to interpret all the facts as consistent either with a progression from a synangial state to sori with separate spor...angia, or as consistent with a progressive coalescence. This conclusion will I think be admitted by those who follow all the * • Studies/ II., pp. 1-6.
Digitized by Google OF SPORE-PRODUCING MEMBERS. 77 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 Marattiacese, where the sori are elongated, such as Dancea, and in a less degree Marattia and Kaulfussia.
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To quickly assess the difficulty of the text, read a short excerpt:
As far as I can see, the facts from fossils would be consistent with either view. Nor does the argument from comparison and develop- ment of living forms lead to any definite conclusion, so long as we treat the Marattiaceae on their own merits, and do not proceed on the assumption that they were descended from Leptosporangiate ferns. Comparing them, inter se, it would be possible to interpret all the facts as consistent either with a progression from a synangial state to sori with separate spor...angia, or as consistent with a progressive coalescence. This conclusion will I think be admitted by those who follow all the * • Studies/ II., pp. 1-6.
Digitized by Google OF SPORE-PRODUCING MEMBERS. 77 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 Marattiacese, where the sori are elongated, such as Dancea, and in a less degree Marattia and Kaulfussia.
What to read after Philosophical Transactions of the Royal Society of London?
You can find similar books in the "Read Also" column, or choose other free books by Royal Society (Great Britain) to read onlineMoreLess
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