Characterization of Hemineura frondosa and the Hemineureae tribe nov. (Delesseriaceae, Rhodophyta) from southern Australia

摘要: Hemineura is endemic to Australia and the sole member of 'Hemineura-Gruppe' , an informal taxon, equivalent a tribe, that Kylin defined primarily by its bicarpogonial supporting cells. We have found cells carry not only two carpogonial branches but also sterile groups, type procarp known for any other family Delesseriaceae or order Ceramiales. The closely related genera Patulophycus, Marionella Laingia all mono­ procarps, suggesting uniquely derived feature. Our observations reveal transverse intercalary cell divisions interpolate within rows horizontal oblique intersect between rows, maintaining branching pattern expanding blade. A comparison morphological features, combined with molecular studies be published elsewhere, strongly suggests Hemineura, Patu­ lophycus, Marionella, Laingia, Botryocarpa, Pseudophycodrys and, possibly, Microrhinus (genera were formerly placed in Delesseria-, Botryocarpaor Pseudophycodrys-groups) belong southern-hemisphere assemblage polystromatic blades, which tribe Hemineureae S.M. Lin, Hommersand & Kraft trib. nov. proposed.