Tavel, Pilze.) Two conjugating branches in contact.
Septation of the conjugating cells (a) from the suspensors (b).
More advanced stage, the conjugating cells (a) are still distinct from one another; the warty thickenings of their walls have commenced to form.
From a comparison of those Euchlorophyceae which have been most closely investigated, it appears probable that sexual reproductive cells have in the course of evolution arisen as the result of specialization among asexual reproductive cells, and that in turn oogamous reproduction has arisen as the result of differentiation of the two conjugating cells into the smaller male gamete and the larger male gamete.
Some Zygnemaceae and Mesocarpaceae form either a short conjugating tube, or none at all, but the filaments approach each other by a knee-like bend, and the zygospore is formed at the point of contact, often being partially contained within the walls of the parent-cell.
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