The Evolution of Plants
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In our eReader you can find the full English version of the book. Read The Evolution of Plants 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 The Evolution of Plants
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146 THE EVOLUTION OF PLANTS The sporangia, as already mentioned, were often much like those of the Osmundas, having a patch of thickened and enlarged cells on one side. In other cases greater elaboration was at- g g g LAB. <* Fig. 15. Stauropteris. Sporangium containing numerous spores, some of which, at the places lettered, are germinating. X about 70. tained; the sporangia were of large size and the apparatus for discharging the spores was on a corresponding scale. Sometimes there was an approach to the ring-mechanism of most modern Ferns, but the ring was usually, if not always, more than one cell in width. In other species THE FERNS 147 again there was no special mechanism of the kind at all. The spores, so far as has been observed, were all of one kind, and correspond in dimensions to those of recent Ferns. The same question might arise here as in the case of other Palaeozoic plants resembling Ferns were they true Ferns or not? It so happens that we have evidence of an unusual kind bearing on the point.
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To quickly assess the difficulty of the text, read a short excerpt:
146 THE EVOLUTION OF PLANTS The sporangia, as already mentioned, were often much like those of the Osmundas, having a patch of thickened and enlarged cells on one side. In other cases greater elaboration was at- g g g LAB. <* Fig. 15. Stauropteris. Sporangium containing numerous spores, some of which, at the places lettered, are germinating. X about 70. tained; the sporangia were of large size and the apparatus for discharging the spores was on a corresponding scale. Sometimes there was an approach to the ring-mechanism of most modern Ferns, but the ring was usually, if not always, more than one cell in width. In other species THE FERNS 147 again there was no special mechanism of the kind at all. The spores, so far as has been observed, were all of one kind, and correspond in dimensions to those of recent Ferns. The same question might arise here as in the case of other Palaeozoic plants resembling Ferns were they true Ferns or not? It so happens that we have evidence of an unusual kind bearing on the point.
What to read after The Evolution of Plants?
You can find similar books in the "Read Also" column, or choose other free books by Dukinfield Henry Scott to read online
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