. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 22 MOSSES AND FERNS dichotomous, and as this is rapidly repeated, it often causes the thallus to assume an orbicular outline. Some forms, however,. 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. New York, The Macmillan Company;

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