The Structure And Development of Mosses And Ferns Archegoniatae
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Development of the archegonium. A, Optical section of the very young archegonial meristem, X22S; B-E, longitudinal sections of young archegonia, X45OJ c, neck canal cell; v, ventral canal cell; o, egg.
it is borne grows for some time by a definite apical cell, which is very evident in horizontal sections (Fig. 263, C).
The development of the archegonium most nearly resembles that of the eusporangiate Ferns. Usually, but not always, no basal cell is formed, and the first division in the inner ce...ll sepa- rates the neck canal cell from the central cell. Both neck and ventral canal cells (Fig. 262, E) equal in breadth the central cell, and in this respect are most like the Marattiacese. The neck canal cell later grows up between the neck cells, but there is usually a space between its summit and the terminal neck 452 MOSSES AND FERNS CHAP.
cells, which here are much longer than the others. It subse- quently divides by a transverse wall, as may happen in the Marattiacese and occasionally in Osmunda, but whether this always takes place is not certain (Fig.
What to read after The Structure And Development of Mosses And Ferns Archegoniatae?
You can find similar books in the "Read Also" column, or choose other free books by Campbell Douglas Houghton to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Development of the archegonium. A, Optical section of the very young archegonial meristem, X22S; B-E, longitudinal sections of young archegonia, X45OJ c, neck canal cell; v, ventral canal cell; o, egg.
it is borne grows for some time by a definite apical cell, which is very evident in horizontal sections (Fig. 263, C).
The development of the archegonium most nearly resembles that of the eusporangiate Ferns. Usually, but not always, no basal cell is formed, and the first division in the inner ce...ll sepa- rates the neck canal cell from the central cell. Both neck and ventral canal cells (Fig. 262, E) equal in breadth the central cell, and in this respect are most like the Marattiacese. The neck canal cell later grows up between the neck cells, but there is usually a space between its summit and the terminal neck 452 MOSSES AND FERNS CHAP.
cells, which here are much longer than the others. It subse- quently divides by a transverse wall, as may happen in the Marattiacese and occasionally in Osmunda, but whether this always takes place is not certain (Fig.
What to read after The Structure And Development of Mosses And Ferns Archegoniatae?
You can find similar books in the "Read Also" column, or choose other free books by Campbell Douglas Houghton to read onlineMoreLess
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