Morphology of Sporophyte of Marchantia domingensis

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Abstract
At the time of fertilization both egg and sperm nucleoli are very conspicuous. Chromantin-like material surrounds the nucleolus of the egg, while granular strands usually project from the sperm. The time of the appearance of the first wall varies. The early development of the sporophyte is the octant type which occurs in the greater number of the Marchantiae. The epibasal cell gives rise to 3 regions: an upper sterile region consisting of 2 rows of cells forming the apical cap; beneath the cap the 2 sporog- enous layers; and underneath them another sterile region contributing to the seta. The hypobasal cell forms the remainder of the seta and foot. The apical cap functions as a conductive system between the massive neck and the sporogenous tissue. The foot early differentiates 2 rows of deeply staining cells that retain this condition even after tetrad formation. The vertical walls of the seta appear thicker than most of the transverse walls, although they do not lose their nuclei. The venter may not begin tangential divisions until after the octant stage has been formed. Sporogenous cells undergo 3 or 4 divisions before spore mother cells are formed. Sporogenous tissue consists of 2 transverse rows, practically half of which become sterile, forming elaters. Vacuolation of the peripheral cytoplasm in the granular elaters is responsible for the spiral thickenings occurring later.

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