. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 470 MOSSES AND FERNS CHAP. or not. According to Janczewski, certain of these rhizogenic buds of the rhizome produce several roots, but the buds remain otherwise undeveloped. In the aerial stems the roots remam normally undeveloped, but may often be stimulated into growth by keeping the stem moist and dark. Van Tieghem ((s), p. 5Si) describes the roots of E. palus- tre as being exogenous, and says they can be traced to a definite cell of one of the young segments. Janczewski ((3), p- 89), howev

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. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 470 MOSSES AND FERNS CHAP. or not. According to Janczewski, certain of these rhizogenic buds of the rhizome produce several roots, but the buds remain otherwise undeveloped. In the aerial stems the roots remam normally undeveloped, but may often be stimulated into growth by keeping the stem moist and dark. Van Tieghem ((s), p. 5Si) describes the roots of E. palus- tre as being exogenous, and says they can be traced to a definite cell of one of the young segments. Janczewski ((3), p- 89), however, was unable to recognise the young root uritil the first. 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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