Abstract
The tribe Monosporeae (Ceramiaceae, Rhodophyta) of Schmitz & Hauptfleischis resurrected to include Monosporus Solier, Mazoyerella Gordon-Mills et Womersley, Tanakaella Itono, Deucalion Huisman et Kraft, Anisoschizus Huisman et Kraft, Guiryella Huisman et Kraft and Desikacharyella Subramanian. These genera all produce multinucleate, uni- to tricellular asexual propagules. Tetrasporangia or polysporangia may occur. Where females are known, the procarp is formed on the subapical cell of the fertile branchlet and (except in Deucalion) some or all of the sterile cells of the procarp divide to produce an inner involucre which surrounds the young gonimoblast. New information is presented on several of the genera. Included are a description of Tanakaella itonoi sp. nov., reproductive details of Anisoschizus post-fertilization details of Deucalion and sporangial, procarp and spermatangial details of Monosporus australis (Harvey) J. Agardh. Tanakaella itonoi sp. nov. differs from T. japonica Itono (the type of the genus, from Japan) in details of its involucral initiation. In T. itonoi one of the sterile pericentral cells remains undivided following fertilization and is not involved in the production of involucral branches; in T. japonica the sterile cell on the supporting cell does not divide.
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