. The Eusporangiatae; the comparative morphology of the Ophioglossaceae and Marattiaceae. Ophioglossaceae; Marattiaceae. Fig. 7. A. Young sporophyte of Boirychium virgini- anum attached to gametophyte, pr, X2. B. A gametophyte with small sporophyte, sp. X4. » :fi^. 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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