. The Eusporangiatae; the comparative morphology of the Ophioglossaceae and Marattiaceae. Ophioglossaceae; Marattiaceae. A. Lower surface of a sporophyll of Kaulfussioj showing circular synangia. 6. Median section of a synangium. X12. C, D. Cross-sections of a synangium. C, Near top. showing openings of loculi. D. Near middle. X12. Ophioglossaceae, and offer no obstacle to the assumption of a fairly close relationship between the Ophioglossaceae and the Marattiaceae, which is indicated by the history of the development of the gametophyte, and the vegetative organs and tissues of the spor
. The Eusporangiatae; the comparative morphology of the Ophioglossaceae and Marattiaceae. Ophioglossaceae; Marattiaceae. A. Lower surface of a sporophyll of Kaulfussioj showing circular synangia. 6. Median section of a synangium. X12. C, D. Cross-sections of a synangium. C, Near top. showing openings of loculi. D. Near middle. X12. Ophioglossaceae, and offer no obstacle to the assumption of a fairly close relationship between the Ophioglossaceae and the Marattiaceae, which is indicated by the history of the development of the gametophyte, and the vegetative organs and tissues of the sporophyte. Perhaps the most marked difference between the tissues of the Marat- tiaceae and the Ophioglossaceae is the prevalence of the mucilage ducts in the tissues of Marattiaceae, but these arise rather late in the history of the sporophyte, and it is. Fig. 189.—Danaa jamaicensis* A. Base of a fertile leaflet, showing synangia, sp. Xi. B. Transverse sections of three synangia. X12. C. Horizontal section of a synangium. significant that they are less developed in the presumably more primitive Kaulfussia than they are in the more specialized types like Angiopteris. Another difference is the deyeloprnerit of sclerenchyma, which is quite absent from the Ophioglossaceae; but this again is also quite absent from Kaulfussia, which, on the whole, must be considered to be the most primitive of the living Marattiaceae and also the form which most closely approaches the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Campbell, Douglas Houghton, 1859-1953. Washington, D. C. , Carnegie Institution of Washington
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