. A textbook of botany for colleges and universities ... Botany. 128 MORPHOLOGY antheridium development resembles closely the eusporangiate method of Sporangium development, and is always associated with it. It is interesting to note that only the Anthoccrotales amon^ brvophvtes approach this method of antheridium formation in the fact that the inner cell following the periclinal division p|ives rise to the sper- matogenous tissue. The sperms are re- markable among pteridophvtes in be- ing biciliate, a char- acter which belorigs to the sperms of bryophytes (fig. 282). Archegonium.— The archego
. A textbook of botany for colleges and universities ... Botany. 128 MORPHOLOGY antheridium development resembles closely the eusporangiate method of Sporangium development, and is always associated with it. It is interesting to note that only the Anthoccrotales amon^ brvophvtes approach this method of antheridium formation in the fact that the inner cell following the periclinal division p|ives rise to the sper- matogenous tissue. The sperms are re- markable among pteridophvtes in be- ing biciliate, a char- acter which belorigs to the sperms of bryophytes (fig. 282). Archegonium.— The archegonium also resembles that of the Anthocerotales in being an embedded structure. The out- line of its develop- ment is as follows: It begins as a super- ficial cell, which divides by a trans- verse wall (fig. 283), the outer cell being the primary neck cell, the inner one the inner cell. The inner cell divides by a transverse wall, re- sulting in a row of three cells (fig. 284), a condition of the archegonium very commonly seen. Be- ginning with the. Fig. 276. —Section of gamctophyte of Lycopodium oom- planatum, showing crown (f) bearing antheridia (a) and archegonia (a') (in one, e, the embryo sporophyte has de- veloped), and the tuberous region (c) with highly differenti- ated tissues. — After 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 Coulter, John Merle, 1851-1928; Barnes, Charles Reid, 1858-1910, joint author; Cowles, Henry Chandler, 1869- joint author. New York, Cincinnati [etc] American book company
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