Abstract
Abstract Wide-angled, non-constricted branches that do not become fastigiate, and spermatangial heads that have few branches are the features that distinguish Scinaia furcata as a new species. Species of Scinaia (Galaxauraceae, Nemaliales) from the Pacific that resemble S. furcata in their smooth, cylindrical axes are S. pseudo-japonica Yamada et Tanaka and S. tsinglanensis Tseng. The only other Hawaiian representative, S. hormoides Setchell, has strong constrictions along the axes and branches. Other features shown by the new species include occasional four-celled carpogonial branches, gonimoblast initials forming laterally from the base of the carpogonium, and decussately branched gonimoblast filaments in which one branch becomes fertile, whereas the other remains undeveloped.
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