Abstract
Abstract Sexual reproduction, previously poorly known for all species of Ballia, has now been studied in detail in B. mariana Harvey, and similar development of procarp and carposporophyte is recorded for B. ballioides (Sonder) Wollaston. Both species are from southern Australia. The four-celled carpogonial branch is borne on the upper side of the supporting cell and the carposporophyte is developed from an auxiliary-cell branch, which finally is four cells long with the terminal cell bearing successive rounded groups of carposporangia. The genus is retained within the Antithamnieae group of Ceramiaceae and features including the development of an auxiliary-cell branch, previously unrecorded in this family, are described and possible affinities of the genus discussed in relation to its reproduction. Spermatangia for B. mariana were previously recorded from South Australia by Wollaston (1968), but are not yet known for B. ballioides.
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