. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 36o MOSSES AND FERNS CHAP. the Osmundaceas, the stem usually bifurcates once, into branches of equal size, which may rarely fork once more. A section of the rhi- zome (Fig. 203, B), shows a massive cortex composed largely of dark sclerenchyma, but the in- ner cortex is parenchym- atous. The central cyl- inder is bounded by an endodermis, within which are from one to four layers of cells con- stituting the pericycle. Faull ((I), p. 7) was un- able to verify Strasburg-; er's statement, that both
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 36o MOSSES AND FERNS CHAP. the Osmundaceas, the stem usually bifurcates once, into branches of equal size, which may rarely fork once more. A section of the rhi- zome (Fig. 203, B), shows a massive cortex composed largely of dark sclerenchyma, but the in- ner cortex is parenchym- atous. The central cyl- inder is bounded by an endodermis, within which are from one to four layers of cells con- stituting the pericycle. Faull ((I), p. 7) was un- able to verify Strasburg-; er's statement, that both: the endodermis and peri- cycle in Osmunda, as in the other Ferns examined, by the latter ((11), p. 449), are of cortical or- igin. Inside the pericycle is a continuous cylinder of phloem, whose outer cells constitute the proto- phloem. The phloem proper consists mainly of sieve-tubes of large size and with conspicuous sieve-plates upon their lateral faces. The so-' 'quergestreckte-i rhizome of O. regalis, showing the arrange- ^ellen" of Zenetti TFip* ment of the vascular bundles, X 4 (after . , De Bary). 204, qu) are considered by Faull to be sieve-tubes., The woody strands form a reticulate cylinder, and in cross-, sections of the stem appear as a circle of horse-shoe shaped, masses of wood lying inside the phloem, and separated from each other by the medullary rays. The tracheary tissue 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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