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In the species under consideration the mother cell of the tetraspores arises as a small bud near the upper end of one of the ordinary cells (Fig. 29, _C_ i).
Occasionally in the same plant that bears tetraspores, but more commonly in special ones, there are produced the sexual organs, and subsequently the sporocarps, or fruits, developed from them.
The non-sexual reproduction is by means of special spores, which from being formed in groups of four, are known as tetraspores.
The antheridia (Fig. 29, _E_) are hemispherical masses of closely set colorless cells, each of which develops a single spermatozoid which, like the tetraspores, is destitute of cilia, and is dependent upon the movement of the water to convey it to the neighborhood of the procarp.
The tetraspores are often imbedded in the tissues of the plant, or may be in special receptacles, nor are they always arranged in the same way as here described, and the same is true of the carpospores.
_C_ i-v, successive stages in the development of the tetraspores, × 150.
The sporophyte then undergoes meiosis to produce haploid tetraspores (which can be male or female) that develop into gametophytes.
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