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