Development of male-conceptacles in Mesophyllum Lemoine and other genera of the Corallinaceae (Rhodophyta)

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Abstract
The development of male conceptacles in Mesophyllum involves the formation of protective and spermatangial initial layers from meristematic cells and subsequent degeneration of the protective layer as centripetal roof formation ensues. Mature conceptacles are characterized by the presence of simple spermatangial mother cells on the floor and roof. This type of male conceptacle appears to be characteristic of Mesophyllum. A review of the literature on the development and mature morphology of male conceptacles in the subfamily Melobesioideae reveals that these features are stable taxonomic characters on the generic level in agreement with certain vegetative features. Spermatangial initials may be formed directly or adventitiously; a protective layer may be present or absent; the roof may be formed vertically or centripetally; and spermatangial mother cell systems may be dendroid or simple in arrangement. The combinations of these features in various genera provide possible insights as to their evol...

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