The Eusporangiatae the Comparative Morphology of the Ophioglossaceae And Maratt
The Eusporangiatae the Comparative Morphology of the Ophioglossaceae And Maratt
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In our eReader you can find the full English version of the book. Read The Eusporangiatae the Comparative Morphology of the Ophioglossaceae And Maratt 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 Eusporangiatae the Comparative Morphology of the Ophioglossaceae And Maratt
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There is present a strand of procam- bium which ends abruptly a short distance below the stem apex. This strand |irobably represents the primary commissural strand, which, as in Datia-t:, is in all probability a truly cauline bundle and has no direct connection with the leaf traces. In the central region of the stem there are now seveial large mucilage ducts, but tannin cells are still absent. In the roots, however, the tannin cells are abundantly developed.
Farmer and Hill's brief account of t...he development of Maratttti fiaxinea agrees with my own observations so far as they have gone, except for the interpretation of the vascular bundles. The "protostele" found in the lower part of the stem is undoubtedly the common bundle of the primary root and the cotyledon, and the open "siphonostele" is really made up of separate leaf traces, which anastomose at certain points to form the large meshes of the very open dictyostele. Farmer and Hill call attention to the fact that the "foliar gaps" are much wider than in Aiigi- optcn's, and in consequence the separate strands, seen in section, form a circle of apparently quite separate bundles, evidently closely approximating the condition found in Datuea and Kaiilfussia.
What to read after The Eusporangiatae the Comparative Morphology of the Ophioglossaceae And Maratt?
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To quickly assess the difficulty of the text, read a short excerpt:
There is present a strand of procam- bium which ends abruptly a short distance below the stem apex. This strand |irobably represents the primary commissural strand, which, as in Datia-t:, is in all probability a truly cauline bundle and has no direct connection with the leaf traces. In the central region of the stem there are now seveial large mucilage ducts, but tannin cells are still absent. In the roots, however, the tannin cells are abundantly developed.
Farmer and Hill's brief account of t...he development of Maratttti fiaxinea agrees with my own observations so far as they have gone, except for the interpretation of the vascular bundles. The "protostele" found in the lower part of the stem is undoubtedly the common bundle of the primary root and the cotyledon, and the open "siphonostele" is really made up of separate leaf traces, which anastomose at certain points to form the large meshes of the very open dictyostele. Farmer and Hill call attention to the fact that the "foliar gaps" are much wider than in Aiigi- optcn's, and in consequence the separate strands, seen in section, form a circle of apparently quite separate bundles, evidently closely approximating the condition found in Datuea and Kaiilfussia.
What to read after The Eusporangiatae the Comparative Morphology of the Ophioglossaceae And Maratt?
You can find similar books in the "Read Also" column, or choose other free books by Campbell Douglas Houghton to read onlineMoreLess
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