. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. vii PTERIDOPHYTA—FILICINE^—OPHIOGLOSSACEM 265 The phloem is composed also of the same elements, large sieve-tubes, arranged in a pretty definite zone next the xylem, and smaller cells of similar appearance, but not showing the multinucleate character or perforated transverse walls of the latter. The sieve-tubes are large (Fig. 145), and in longi- tudinal section are seen to consist of rows of wide cells with either horizontal or oblique division walls. The transverse walls separating two membe

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. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. vii PTERIDOPHYTA—FILICINE^—OPHIOGLOSSACEM 265 The phloem is composed also of the same elements, large sieve-tubes, arranged in a pretty definite zone next the xylem, and smaller cells of similar appearance, but not showing the multinucleate character or perforated transverse walls of the latter. The sieve-tubes are large (Fig. 145), and in longi- tudinal section are seen to consist of rows of wide cells with either horizontal or oblique division walls. The transverse walls separating two members of a sieve-tube are somewhat swollen and show small perforations, which are not always. 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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