. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 328 MOSSES AND FERNS plant exceeds the leaves. In a plant with the fourth leaf still unfolded, there were six fully-developed roots. The gaps in the vascular cylinder become more and more prominent as the sporophyte develops, and there is finally formed the wide-meshed reticulate cylinder found in the adult sporophyte. In some Ferns, e. g., Pteris aquilina, there are developed medullary steles which arise from the inner surface of the primitive stelar tube. (See Jeffrey (3), pp. 133, 134)-. Fi
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 328 MOSSES AND FERNS plant exceeds the leaves. In a plant with the fourth leaf still unfolded, there were six fully-developed roots. The gaps in the vascular cylinder become more and more prominent as the sporophyte develops, and there is finally formed the wide-meshed reticulate cylinder found in the adult sporophyte. In some Ferns, e. g., Pteris aquilina, there are developed medullary steles which arise from the inner surface of the primitive stelar tube. (See Jeffrey (3), pp. 133, 134)-. Fig. iSi.^A, Vertical longitudinal section of the apex of a rhizome of Adiantu»i' emarginatum, X25; B, the central part of the same. X180; L, a .young leaf; C,- cross-section of a similar stem apex, X180; D, apex of a young leaf of Onoclea struthiopteris, showing the apical cell (x). The Mature Sporophyte The Stem The stem in most of the Polypodiaceas is either an erect or creeping rhizome which, unlike that of the Eusporangiatse, often; branches freely. These branches are almost always formed" monopodially, and are usually of the same structure as the main axis; but in O. struthiopteris great numbers of peculiar stolons'. 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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