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Typification of the Australasian Brown Alga Zonaria turneriana J. Agardh (Dictyotales) and Description of the Endemic New Zealand Species, Zonaria aureomarginata sp. nov.

There are two species of Zonaria in New Zealand, instead of one highly variable species as previously thought. Zonaria turneriana was described by J. Agardh (1870) in a paper dealing with algae from the Chatham Islands, New Zealand. The type specimen was not cited in the description, which refers generally to collections of Z. turneriana from New Zealand and Australia. Subsequently, two lectotypes have been designated, one from the South Island and the other from the Chatham Islands, but neither are considered to be appropriate. A specimen from Turner's herbarium, which would have been available to J. Agardh when he described the species, is selected as the lectotype of Z. turneriana. The new species, Zonaria aureomarginata, is described. Zonaria aureomarginata and Z. turneriana are similar in morphology, sporangial and gametangial structure but they differ markedly in vegetative anatomy. Unlike Z. turneriana and every other species of Zonaria, the medullary cells of Z. aureomarginata vary greatly in size and are not always aligned in regular rows. In transverse section, one to four (Z. aureomarginata) instead of one to two cortical cells (Z. turneriana) occupy the width of a medullary cell. Zonaria aureomarginata is found only on the North Island, the Marlborough region of the South Island, the Chatham and Three Kings Islands, New Zealand. The biogeographic affinities of the ten species of Zonaria are discussed.