. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. LYCOPODINEM 521 four-sided one, from which are then produced two similar ones by the formation of a median wall, and a true dichotomy of the primary axis thus takes place at once, the two new branches growing out at right angles to the cotyledon. While this may also occur in 6". Kraussiana (Fig. 301, D), it is not always the case, and frequently the young plant remains unbranched until it has reached a length of a centimetre or more, and has pro- duced numerous Fig. 301.—Selagmel
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. LYCOPODINEM 521 four-sided one, from which are then produced two similar ones by the formation of a median wall, and a true dichotomy of the primary axis thus takes place at once, the two new branches growing out at right angles to the cotyledon. While this may also occur in 6". Kraussiana (Fig. 301, D), it is not always the case, and frequently the young plant remains unbranched until it has reached a length of a centimetre or more, and has pro- duced numerous Fig. 301.—Selagmella Kraussiana. A, Macrospore with the prothallium (.pr), X50; B, young sporophyte still attached to the spore (sp), X8; cot, cotyledons; R, root; C, upper part of an older stage, X6; D, a still older one showing the first di- chotomy, X4- The embryo of S. spinulosa (Bruchmann (4) ) has a short and massive suspensor, and no foot is developed. Miss Lyon (2) found that in both S. apus and 5". rupestris, fertilisation occurred while the spores were still within the spo- rangium, and the sporangium attached to the strobilus. "The strobilus of S. rupestris retains its physiological connection. 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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