. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 3S4 MOSSES AMD FERNS B. The mother cell of the archegonium is scarcely distinguishable from the neighbouring cells, either in size or contents, and can- not always be identified until after the first transverse divisions. The development is much as in the other Ferns, but there are some differences that may be noted. The first trans- verse division, as in these, separates the cover cell from the inner cell, and the latter may divide into a basal and central cell, but sometimes this divi
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 3S4 MOSSES AMD FERNS B. The mother cell of the archegonium is scarcely distinguishable from the neighbouring cells, either in size or contents, and can- not always be identified until after the first transverse divisions. The development is much as in the other Ferns, but there are some differences that may be noted. The first trans- verse division, as in these, separates the cover cell from the inner cell, and the latter may divide into a basal and central cell, but sometimes this division is omitted, and the basal cell is absent. The cover cell divides by the usual cross - walls into the four primary neck cells, which here all develop alike, and the neck remains straight. The complete neck has about six tiers of cells. The separation of the neck and ventral canal cells follows in the usual manner, but occasionally the former may be divided by a transverse cell wall (Fig. 197, A), although ordinarily the division is confined to the nucleus. The neck cells have small nuclei, and in the liv- ing state are almost trans- parent, with little chloro- phyll. Small glistening bod- ies, apparently of albumin- â FiG. 197.âA, Young archegonium of o. ous nature, are often present, cinnamomea. with the neck canal cell ^jjjj ^rC especially COUSpJCU- divided by a cell wall; B, a. nearly ripe . * i i: j ⢠1, archegonium of the same species, X52S. OUS in material nxeu Wltn chromic acid. Kny and Luerssen both speak of the quantity of starch in the axial row of cells in O. regalis, but in neither O. cinnamomea nor O. Clay- toniana was this noticeable. As the egg approaches maturity the nucleus becomes large and distinct, and one or two nucleoli. 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,
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