A PROPOSAL TO RESURRECT THE TRIBE MONOSPOREAE SCHMITZ-ET-HAUPTFLEISCH, WITH A DESCRIPTION OF TANAKAELLA-ITONOI SP-NOV (CERAMIACEAE, RHODOPHYTA) FROM SOUTHERN AND WESTERN-AUSTRALIA

The tribe Monosporeae (Ceramiaceae, Rhodophyta) of Schmitz & Hauptflei sch is resurrected to include Monosporus Solier, Mazoyerella Gordon-Mi lls et Womersley, Tanakaella Itono, Deucalion Huisman et Kraft, Anisos chizus Huisman et Kraft, Guiryella Huisman et Kraft and Desikacharyell a Subramanian. These genera all produce multinucleate, uni- to tricell ular asexual propagules. Tetrasporangia or polysporangia may occur. Wh ere females are known, the procarp is formed on the subapical cell of the fertile branchlet and (except in Deucalion) some or all of the ste rile cells of the procarp divide to produce an inner involucre which s urrounds the young gonimoblast. New information is presented on severa l of the genera. Included are a description of Tanakaella itonoi sp. n ov., reproductive details of Anisoschizus post-fertilization details o f Deucalion and sporangial, procarp and spermatangial details of Monos porus 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 pericent ral cells remains undivided following fertilization and is not involve d in the production of involucral branches; in T. japonica the sterile cell on the supporting cell does not divide.